(d) Potential energy of the ball at the highest point is mgh.
Reason — At the highest point, the ball has maximum potential energy. The potential energy at a height h, above the ground is given by the formula mgh.
Question
A ball of mass m is thrown vertically up with an initial velocity so as to reach a height h. The correct statement is: (a) Potential energy of the ball at the ground is mgh. (b) Kinetic energy of the ball at the ground is zero. (c) Kinetic energy of the ball at the highest point is mgh. (d) Potential energy of the ball at the highest point is mgh.
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The diagram given below shows a ski jump. A skier weighing 60kgf stands at A at the top of ski jump. He moves from A and takes off for his jump at B. 
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A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground. Taking g = 10ms-1, calculate: (a) the potential energy possessed by the ball when it is initially at rest. (b) the kinetic energy of the ball just before it hits the ground? (c) What happens to the mechanical energy after the ball hits the ground and comes to rest?
Open Answer »Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when(i) the body is at the top,(ii) the body has fallen a distance x,(iii) the body has reached the ground.
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