A stone of mass 300g is released from rest from the top of a bulding...

WAEC 2011

A stone of mass 300g is released from rest from the top of a bulding of height 100m. Determine the kinetic energy gained by the stone when it is a quarter way down from the point of release.[g = 10 ms^-2]

A. 750.0J
B. 225.0J
C. 75.0J
D. 22.5J

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Correct Answer: Option C

Explanation

K.E = P.E = mgh

= 0.3 x 10 x 100 - 0.3 x 10 x 75

= 75J

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A stone of mass 300g is released from rest from the top of a bulding...

Correct Answer: Option C

Explanation

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