Work , energy and power questions | form one Physics

A catapult is used to fire a stone of mass 30 g vertically to a height of 5 m. Calculate the:
(i) potential energy gained by the stone.
(ii) speed of the stone as it leaves the catapult.

Answer / Solution

UNSOLVED

A machine is able to lift 200 kg of bricks vertically up to a height of 30 m above the ground in 50 seconds. This implies that, the power of the machine in kilowatts is
A 0.12
B 1.2
C 6
D 1,200
E 3.
 

Answer / Solution

UNSOLVED

When a body of mass M, is lifted through a height h, it possesses the energy known as
A kinetic energy. B chemical energy.
C light energy. D potential energy.

Answer / Solution

D potential energy.

Calculate the power of a pump which can lift 200 kg of water through a vertical height of 6 m in 10 seconds.

Answer / Solution

UNSOLVED

A 1000 kg car is travelling down the road at a speed of 15 m/s. How much kinetic energy does it have?

Answer / Solution

UNSOLVED