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A machine gun is mounted on an armored c...

A machine gun is mounted on an armored car moving with a speed of `20 ms^(-1)`. The gun point against the direction of motion of car. The muzzle speed of bullet is equal to speed of sound in air i.e., `340 ms^(-1)`. The time difference between bullet actually reaching and sound of firing reaching at a target `544 m` away from car at the instant of firing is reaching at a target `544 m` away from car at the instant of firing is

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(A) : When bullet is fired from a gun, the gunner should exert force on gun in the direction of motion of bullet. (R) : The gun recoils when bullet is fired.

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