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