A boy standing at the top of a 20-metre-high tower drops a stone. Assuming g = 10 m/s2, the velocity with which the stone hit the ground is:

A boy standing at the top of a 20-metre-high tower drops a stone. Assu

1.	A boy standing at the top of a 20-metre-high tower drops a stone. Assuming g = 10 m/s2, the velocity with which the stone hit the ground is:
A.	10 m/s
B.	20 m/s
C.	15 m/s
D.	25 m/s
Answer» C. 15 m/s

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A boy standing at the top of a 20-metre-high tower drops a stone. Assuming g = 10 m/s2, the velocity with which the stone hit the ground is:

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