# Motion Worksheet-13

Motion Worksheet-13

1. A train travels at a speed of 60 km/h for 0.52 h, at 30 km/h for the next 0.24 h and then at 70 km/h for the next 0.71 h. What is the average speed of the train?

A. 5.99 km/h                                 B. 59.9 km/h

C. 5.9 km/h                                   D. 59.9 m/s

1. The odometer of a car reads 2000 km at the start of a trip and 2400 km at the end of the trip. If the trip took 8 h, calculate the average speed of the car is :

A. 50 km h–1

B. 13.9 ms–1

C. Both 50 km h–1 and 13.9 ms–1

1. A moving train is brought to rest within 20 seconds by applying brakes. Find the initial velocity. If the retardation due to brakes is 2 ms–2

A. 10 ms–1         B. 3 ms–2           C. 40 ms–1         D. 40 ms–2

1. A scooter moving at a speed of 10 m/s is stopped by applying brakes which produce a uniform acceleration of, –0.5 m/s2. How much distance will covered by the scooter before it stops?

A. 500 metres                               B. 100 metres

C. 20 metres                                 D. 100 centimetres

1. A cyclist goes around a circular track once every 2 minutes. If the radius of the circular track is 105 metres, calculate his speed. (Given ) π = (22/7)

A. 6.2 m/s         B. 6.5 m/s         C. 5.5 m/s          D. 5.2 m/s

1. A body starts to slide over a horizontal surface with an initial velocity of 0.5 m/s. Due to friction, its velocity decreases at the rate of 0.05 m/s2 (acceleration, –0.05 m/s2). How much time will it take for the body to stop?

A. 10 seconds                                 B. 1 seconds

C. 100 seconds                              D. 0.10 seconds

1. Usha swims in a 90 m long pool. She covers 180 m in one minute by swimming from one end to the other and back along the same straight path. Find the average speed and average velocity of Usha.

A. average speed  is 0 m s–1 and average velocity is 3 m s–1

B. Both are 0 m s–1

C. Both are 3 m s–1

D. average speed  is 3 m s–1 and average velocity is 0 m s–1

1. B

2. C

3. C

4. B

5. C

6. A

7. D