Question on: WAEC Physics - 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 Option: C
K.E = P.E = mgh
= 0.3 x 10 x 100 - 0.3 x 10 x 75
= 75J
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