Starting from rest,a fan takes five seconds to attain the maximum speed of 400 rpm.(revolutions per minute) .Assuming constant acceleration,find the time takesn by the fan in attaining half the maximum speed.

A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming that the acceleration is uniform Find the distance travelled by the train for attaining this velocity.

A train starting from rest attains a velocity of 72 km/h in 5 minutes. Assuming that the acceleration is uniform Find the acceleration.

A train starting from a railway station and moving with uniform acceleration attains a speed of 40km/h in 10 minutes. Find its acceleration.

A train starting from a railway station and moving with uniform acceleration attains a speed 40 kmh^(-1) in 10 minutes. Find its acceleration.

A body starts from rest moves with constant acceleration p. Find the ratio of the distances travelled by the body in 5 seconds and 5th second.

A man stands on a rotating platform, with his arms stretched horizontally holding a 5 kg weight in each hand. The angular speed of the platform is 30 revolutions per minute. The man then brings his arms close to his body with the distance of each weight from the axis changing from 90cm to 20cm. The moment of inertia of the man together with the platform may be taken to be constant and equal to 7.6 kg m^2 :- What is his new angular speed? (Neglect friction.)

A man stands on a rotating platform, with his arms stretched horizontally holding a 5 kg weight in each hand. The angular speed of the platform is 30 revolutions per minute. The man then brings his arms close to his body with the distance of each weight from the axis changing from 90cm to 20cm. The moment of inertia of the man together with the platform may be taken to be constant and equal to 7.6 kg m^2 :- Is kinetic energy conserved in the process? If not, from where does the change come about?

A truck starts from rest and rolls down a hill with constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force on it if its mass is 7 metric tonnes.