# An object falls freely from a height of 25m onto the roof a building 5m...

Question 476
A
17.3$$ms^{-2}$$
B
20$$ms^{-2}$$
C
24.5$$ms^{-2}$$
D
125$$ms^{-2}$$
E
200$$ms^{-2}$$
##### 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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