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An object falls freely from a height of 25m onto the roof a ...

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 $ms^{-2}$

E.

200 $ms^{-2}$

View answer & explanation

Correct answer is B

$v^2=u^2 +2as =0 +2\times(25-5)\\ v^2 =0+20\times 20=400;v =\sqrt{400}= 20(ms^{-2}$

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