From a stationary tank of mass 125000 pound a small shell of mass 25 pound is fired with a muzzle velocity of 1000 ft/sec. The tank recoils with a velocity of

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0.1 ft/sec

0.2 ft/sec

0.4 ft/sec

0.8 ft/sec

answer is B.

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Detailed Solution

According to conservation of momentumMomentum of tank = Momentum of shell125000 × vtank = 25 × 1000 ⇒ vtank = 0.2 ft/sec.

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