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21. A body of mass 0.25 kg is projected with muzzle velocity 100ms ^-1 from a tank of mass 100 kg. What is the recoil velocity of the tank

(a)  5 ms -1                               (b) 25ms -1

(c)   0.5 ms -1                          (d) 0.25 ms -1

ans. d

(11)

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