24 April 2014

CBSE PHYSICS class 9th Motion Numerical Problems

1. An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.

2. A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car.

3. Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.6 seconds, what will be his final velocity and how far will he fall?

4. A race car accelerates uniformly from 18.5 m/s to 46.1 m/s in 2.47 seconds. Determine the acceleration of the car and the distance traveled.

5. A feather is dropped on the moon from a height of 1.40 meters. The acceleration of gravity on the
moon is 1.67 m/s2. Determine the time for the feather to fall to the surface of the moon.

6. Rocket-powered sleds are used to test the human response to acceleration. If a rocket-powered sled is
accelerated to a speed of 444 m/s in 1.8 seconds, then what is the acceleration and what is the distance that the sled travels?

7. A bike accelerates uniformly from rest to a speed of 7.10 m/s over a distance of 35.4 m. Determine
the acceleration of the bike.

8. An engineer is designing the runway for an airport. Of the planes that will use the airport, the lowest
acceleration rate is likely to be 3 m/s2. The takeoff speed for this plane will be 65 m/s. Assuming this
minimum acceleration, what is the minimum allowed length for the runway?
9. A car traveling at 22.4 m/s skids to a stop in 2.55 s. Determine the skidding distance of the car
(assume uniform acceleration).

10. A kangaroo is capable of jumping to a height of 2.62 m. Determine the takeoff speed of the
kangaroo.

11. If Michael Jordan has a vertical leap of 1.29 m, then what is his takeoff speed and his hang time
(total time to move upwards to the peak and then return to the ground)?

12. A bullet leaves a rifle with a muzzle velocity of 521 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.840 m. Determine the acceleration of the bullet (assume a
uniform acceleration).

13. A baseball is popped straight up into the air and has a hang-time of 6.25 s. Determine the height to
which the ball rises before it reaches its peak. (Hint: the time to rise to the peak is one-half the total
hang-time.)

14. The observation deck of tall skyscraper 370 m above the street. Determine the time required for a
penny to free fall from the deck to the street below.

15. A bullet is moving at a speed of 367 m/s when it embeds into a lump of moist clay. The bullet
penetrates for a distance of 0.0621 m. Determine the acceleration of the bullet while moving into the
clay. (Assume a uniform acceleration.)

16. A stone is dropped into a deep well and is heard to hit the water 3.41 s after being dropped.
Determine the depth of the well.

17. It was once recorded that a Jaguar left skid marks that were 290 m in length. Assuming that the
Jaguar skidded to a stop with a constant acceleration of -3.90 m/s2, determine the speed of the Jaguar
before it began to skid.

18. A plane has a takeoff speed of 88.3 m/s and requires 1365 m to reach that speed. Determine the
acceleration of the plane and the time required to reach this speed.

19. A dragster accelerates to a speed of 112 m/s over a distance of 398 m. Determine the acceleration
(assume uniform) of the dragster.

20. With what speed in miles/hr (1 m/s = 2.23 mi/hr) must an object be thrown to reach a height of 91.5
m (equivalent to one football field)? Assume negligible air resistance.

Solutions
1. . d = 1720 m
2. a = 8.10 m/ s2
3. V = -25.5 m/s (- indicates direction)
4. a = 11.2 m/s2 , d = 79.8 m
5. t = 1.29 s
6. a = 247 m/s2
7. d = 400 m
8. a = 0.712 m/s2
9. d = 704 m
10. d = 28.6 m
11. vi = 7.17 m/s
12. vi = 5.03 m/s
13. hang time = 1.03 s
14. a = 1.62*105 m /s2
15. vi = 30.6 m/s , d = 47.9 m
16. t = 8.69 s
17. a = -1.08*106 m /s2
18. d = -57.0 m
19. vi = 47.6 m /s
20. a = 2.86 m/s2
21. t = 30. 8 sa = 15.8 m/s2
22. vi = 42.3 m/s , vi = 94.4 mi/hr

5 comments:

megha said...

Thanks .. they will help me a lot in improving my calculations and understanding in physics.. :D

Jim Smallwood said...

A stone is thrown in a vertically upword direction with a velocity of 5m/sec, if the acceleration of the stone during its motion is 10m/sec square in the downward direction, what will be the height attained by the stone and how much time will it take to reach there.... plz solve

PRAKHAR KAMAL said...

A ball hits a wall horizontally at 6.0 m s.it rebounds horizontally at 4.4 m s.The ball is in contact with the wall for 0.040 second.What is the acceleration of the ball ?

simran kb said...

a body starts from rest its accelerating at a costant tate of 5ms2 calculate speed accquired and distance travelled in 7 min?

simran kb said...

a van is accelerated uniformally from 36 km/hr in 3 sec caculate
1. the acceleration
2. the distance covered

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