A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface and fires 10 shots horizontally. Each bullet has a mass 10 g and a muzzle velocity of 800 ms-1. The velocity which the rifle man attains after firing 10 shots is

Question

A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface and fires 10 shots horizontally. Each bullet has a mass 10 g and a muzzle velocity of 800 ms-1. The velocity which the rifle man attains after firing 10 shots is (A) 8 ms-1 (B) 0.8 ms-1 (C) 0.08 ms-1 (D) 0.088 ms-1

Tardigrade Admin · Accepted Answer

According to law of conservation of momentum, 100 v=-(10/1000) × 10 × 800 i.e., v=0.8 ms -1.

Q. A rifle man, who together with his rifle has a mass of $100 k g$ , stands on a smooth surface and fires $10$ shots horizontally. Each bullet has a mass $10 g$ and a muzzle velocity of $800 m s^{- 1}$ . The velocity which the rifle man attains after firing $10$ shots is

$8 m s^{- 1}$

$0.8 m s^{- 1}$

$0.08 m s^{- 1}$

$0.088 m s^{- 1}$

According to law of conservation of momentum,
$100 v = - \frac{10}{1000} \times 10 \times 800$
i.e., $v = 0.8 m s^{- 1}$ .

Q. A rifle man, who together with his rifle has a mass of 100kg, stands on a smooth surface and fires 10 shots horizontally. Each bullet has a mass 10g and a muzzle velocity of 800ms−1. The velocity which the rifle man attains after firing 10 shots is

8ms−1

0.8ms−1

0.08ms−1

0.088ms−1