Chapter 9, Problem 82A

To determine

To Explain: The Difference in exit speed of two bullets.

Explanation of Solution

Introduction:

Momentum is simply a ‘mass in motion’. When any object having mass is moving, it have momentum. It is the product of mass of an object and its velocity.

Mathematically,

  $p=mv$

Where, $p$ is momentum, $m$ is mass and $v$ is velocity of object.

Mass of each bullet is 0.11 kg and the force exerted on them is same.Here, momentum is directly proportional to velocity.

Since, pistol’s bullet has speed 323 m/swhile rifle’s bullethas speed 396 m/s which means that the bullet with higher velocity (396 m/s) gained larger momentum. This is because the bullet is in the rifle for longer time.