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Two balls of equal masses are thrown upw...

Two balls of equal masses are thrown upwards, along the same vertical direction at an interval of 2 seconds, with the same initial velocity of `40m//s`. Then these collide at a height of (Take `g=10m//s^(2)`).

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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