An iron ball having a mass of 5 kg is lifted from the floor to a height of 2.5 meters above the floor. (Remember, kilograms (kg) is a measure of mass, not of weight.)
a) How much work was done to lift the ball?
b) How much potential energy did the ball gain?
c ) If the motor lifting the ball raises it 2.5 meters in tenseconds, what is its power?