How much momentum will a dumb-bell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration to be 10 m`s^(-1)`??

A boy of mass 50 kg runs up a staircase of 45 steps in 9 s. If the height of each step in 15 cm, find his power. Take g=10ms^(-2) .

A wooden block of mass 2 kg rests on a soft horizontal floor. When an iron cylinder of mass 25 kg is placed on top of the block, the floor yields steadily and the block and the cylinder together go down with an acceleration of 0.1 m s^(-2) . What is the action of the block on the floor (a) before and (b) after the floor yields ? Take g = 10 m s^(-2) . Identify the action-reaction pairs in the problem.

A ball whose density is 0.4 xx 10^3 kg//m^3 falls into water from a height of 9 cm. To what depth does the ball sink ?

A body of mass 3 kg fall freely from the building of height 60 m . Its kinetic energy after 3s will be ………

How much power is required a lift a body of mass 50 kg to a height of 120 m in 1 minute ? (g = 9.8 m//s^(2)) .

A Rubber Ball Rebound A rubber ball of mass 2.0kg falls to the floor. The ball hits with a speed of 8m/s and rebounds with approximately the same speed. High speed photographs show that the ball is in contact with the floor for 10^-3s. What can we say about the force exerted on the ball by the floor?

Calculate the power of a crane in watts, which lifts a mass of 100 kg to a height of 10 m in 20 s.

Velocity of a car of mass 1500 kg increases regularly from 36 km h^(-1) to 72 km h^(-1) then change in its momentum would be kg m s^(-1)