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 m s\(^{-1}\). The velocity which the rifle man attains after firing 10 shots is:

• A. \(8 \text{ m s}^{-1}\)
• B. \(0.8 \text{ m s}^{-1}\)
• C. \(0.08 \text{ m s}^{-1}\)
• D. \(-0.8 \text{ m s}^{-1}\)

Hint:

On a frictionless surface, total horizontal momentum is conserved. Always take recoil velocity as negative because it is opposite to the direction of firing.

Answer 1

The Correct Option is D