An object falls freely from a height of 25m ont... - WAEC Physics 1997 Question
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 option: b
\(v^2=u^2 +2as =0 +2\times(25-5)\ v^2 =0+20\times 20=400;v =\sqrt{400}= 20(ms^{-2}\)
Please share this, thanks:
Add your answer
No responses