1.

A stone dropped from the top of the tower touches the ground in 4 sec. The height of the tower is about                [MP PET 1986; AFMC 1994; CPMT 1997; BHU 1998;  DPMT 1999; RPET 1999; MH CET 2003]

A.             \[=\left[ 7\times 5+\frac{1}{2}4\times {{(5)}^{2}} \right]-\left[ 7\times 4+\frac{1}{2}4\times {{(4)}^{2}} \right]=25\ m\]
B.             \[40\,m\]
C.             \[20\,\,m\]        
D.             \[160\,\,m\]
Answer» B.             \[40\,m\]


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