1.

A boy standing at the top of a tower of 20 m height drops a stone. Assuming \[g=10\text{ }m{{s}^{-2}}\], the  velocity with which it hits the ground is

A. \[10.0\,m/s\]      
B. \[20.0\,m/s\]
C. \[40.0\,m/s\]      
D. \[5.0\,m/s\]
Answer» C. \[40.0\,m/s\]      


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