A body of mass 20g projected vertically upwards in vacuum returns to the point of...

WAEC 2013

A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms^-2]. Determine the potential energy of the body at the maximum height of its motion

A. 0.36J
B. 0.72J
C. 360.00J
D. 720.00J

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Correct Answer: Option A

Explanation

P.E at max = K.E on projection

= \(\frac{1}{2}\)mv² = \(\frac{1}{2} \times 0.02 \times 6^2 = 0.36J\)

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A body of mass 20g projected vertically upwards in vacuum returns to the point of...

Correct Answer: Option A

Explanation

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