First slide

Release from certain height

Question

A stone is dropped into a lake from a tower 500 m high. The sound of the splash will be heard by a man on the tower after:

Easy

A

21s
B

10s
C

11.5s
D

14s

Solution

$Required time = \sqrt{\frac{2 u}{g}} = \frac{h}{v_{sound}} = \sqrt{\frac{2 \times 500}{100}} + \frac{500}{330} = 11 .5 s$

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