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Two identical balls are shot upward one ...

Two identical balls are shot upward one after another at an interval of 2s along the same vertical line with same initial velocity of `40 ms^-1`. The height at which the balls collide is

A

2

B

3

C

4

D

5

Text Solution

Verified by Experts

The correct Answer is:
D
` 40 n -(1)/(2) gn^(2) =40 ( n-2) -(1)/(2) g( n-2) ^(2) `
At the instant of collision, the balls are at the same height. Solve to get n= 5 sec
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