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Two balls are dropped to the ground from...

Two balls are dropped to the ground from different heights. One ball is dropped 2 s after the other but they both strike the ground at the same time. If the first ball takes 5 s to reach the ground, then the difference in initial heights is (Take `"g = 10 m s"^(-2)`)

A

20m

B

80m

C

170m

D

40m

Text Solution

Verified by Experts

The correct Answer is:
B
When `t_1 = 5 sec`
`h_1 = 1/2 g t_1^2 = 1/2 xx 10 xx 25 = 125m`
when `t_1 = 3sec`
when `t_2 = 3 sec`
`h_2 = 1/2 xx 10 xx 9 = 45m`
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