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A bullet emerges from a barrel of length...

A bullet emerges from a barrel of length `1.2 m` with a speed of `640 ms^(1)`. Assuming constant acceleration, after the gun is fired is

A

4ms

B

40ms

C

`400mus`

D

`1s`

Text Solution

Verified by Experts

The correct Answer is:
A
`v^2 = u^2 + 2aS `
`rArr = (v^2 - u^2)/(2s) = ((640)^2)/(2xx1.2)`
`v = u + at rArr t = v/a = (640)/((640)^2) 2 xx 1.2 = 3.75 xx 10^(-3) sec`
=4ms
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