1.

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 isA. 4mB. 40mC. 400usD. 1s

Answer» Correct Answer - B
`s=12m, upsilon=640 ms^(-1)`
`a=?, u=0, t = ? 2as = upsilon^(2)-u^(2)`
`rArr 2axx12=640xx640rArr a=(8xx64xx100)/(3)`
`upsilon=u+at rArr t=(upsilon)/(a)=(640xx3)/(8xx64xx100)=37.5xx10^(-3)s~~40 ms`


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