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Energy and It's Sources

Two boys A an...

Question

Two boys A and B are standing at two positions as shown in the diagram. Each step is 20 cm high and 20 cm wide. The potential energy is assumed to be zero at the ground. Consider $g = 10 m / s^{2}$ and assume that there is no loss of energy.

What is the kinetic energy of the ball at the point of release?

A

10.5 J

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B

8 J

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C

0 J

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D

10 J

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Solution

The correct option is C 0 J
The velocity of the object is zero when it is dropped.
Since the velocity of the ball is zero, the kinetic energy will be zero.

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