Question

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

• A. 0.1 ft/sec
• B. 0.2 ft/sec
• C. 0.4 ft/sec
• D. 0.8 ft/sec

Answer 1

The correct option is B

0.2 ft/sec

According to conservation of momentum

Momentum of tank = Momentum of shell

$25\times 1000$ = $124975\times v$

v= 0.2 $\frac{ft}{s}$