9ii Forces and laws-Numericals-1

A racing car at rest accelerates uniformly to a velocity of 144 km/hr in 20 s. Find value of acceleration of the car.

• 5 m/s²

• 2 m/s²

• 0.2 m/s²

• 0.5 m/s²

The brakes applied to a running train produce an acceleration of 0.6 m/s² in a direction opposite that of motion. If train takes 60s to stop after application of brakes, calculate distance travelled before coming to rest.

• 1080 m

• 1200 m

• 1500m

• 2156 m

Starting from a stationary position, Satvik attain a velocity of 20 m/s in 4 s, while competing for a race. Calculate his acceleration during the period. Assume the acceleration to be unifrom.

• 2 m/s²

• 3 m/s²

• 8 m/s²

• 5 m/s²

Usha swims in a 90m long pool. She covers 180m in 1 minute by swimmimg one to other and back along the same straight line. Find the average velocity.

• 3 m/s

• 1.8 m/s

• 0 m/s

• 2 m/s

A tow truck exerts a force of 3000 N on a car, accelerating it at 3 m/s². What is the mass of the car?

• 1000 N

• 1000 kg

• 9000 N

• 9000 kg

• 10 000 kg