An object falls freely from a height of 25m onto the roof a building 5m...
PHYSICS
WAEC 1997
An object falls freely from a height of 25m onto the roof a building 5m high. Calculate the velocity with which the object strikes the roof (g=10\(ms^{-2}\)
- A. 17.3\(ms^{-2}\)
- B. 20\(ms^{-2}\)
- C. 24.5\(ms^{-2}\)
- D. 125\(ms^{-2}\)
Correct Answer: B. 20\(ms^{-2}\)
Explanation
\(v^2=u^2 +2as =0 +2\times(25-5)\\ v^2 =0+20\times 20=400;v =\sqrt{400}= 20(ms^{-2}\)
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