Question:
A boy standing at the top of a tower of 20 m height drops a stone.assuming g =10 m/sec ,the velocity with which it hits the ground is
Answer:
Using equation, v2= u2+2 a s
Given, s= height of the tower= 20m , u=0 m/sec, because in case of free fall we take the initial velocity is zero , a=g= 10
So, v2= 0+2×10×20
v2= 400
v= 20m/sec
So, the stone will hit the ground with velocity 20m/sec
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