An iron ball is dropped freely from a tower and it strikes the ground after seconds. Calculate the height of the tower from the ground. (take g = 9.8m/s2) [Ans: 122.5m]
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lThe formula for time of flight is t=
g
2h
where h is the height from which ball is dropped.
since, t=4s
Putting the value in above formula,
4=
9.8
2h
h=7.84m
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