A stone of mass 300g is released from rest from the top of a bulding...
PHYSICS
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
Correct Answer: C. 75.0J
Explanation
K.E = P.E = mgh = 0.3 x 10 x 100 - 0.3 x 10 x 75 = 75J
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