A boy standing at the top of a 20-metre-high tower drops a stone. Assuming g = 10 , the velocityÂ with which the stone hits the ground is:_x005F_x000D_

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 , the velocityÂ with which the stone hits the ground is:_x005F_x000D_
A.	10 m/s
B.	20 m/s
C.	15 m/s
D.	25 m/s
Answer» C. 15 m/s