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A stone released with zero velocity from the top of a tower, reaches the ground in 4 sec. The height of the tower is (g = 10m /s2)
(a) 20 m
(b) 40 m
(c) 80 m
(d) 160 m
(c)Initial velocity (u) = 0; Time (t) = 4 sec and gravitational acceleration (g) = 10 m/s2. Height of tower h= ut+ 1/2 gt^2= (0×4 )+1/2×10× (4)^2 = 80 m.
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