From a stationary tank of mass 125000 poun

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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 ............ $\mathrm{ft/sec}$

A

$0.1$

B

$0.2$

C

$0.4$

D

$0.8$

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 ............ $\mathrm{ft/sec}$

According to conservation of momentum
Momentum of tank = Momentum of shell
$125000 × v_{tank} = 25 × 1000 ==> v_{tank}= 0.2 ft/sec.$