The mass of a bullet is 8g, its speed is 600m / s, so that a hockey puck weighing 200g

The mass of a bullet is 8g, its speed is 600m / s, so that a hockey puck weighing 200g has the same impulse, it must move at a speed.

Given:

m1 = 8 grams = 0.008 kilograms – bullet mass;

v2 = 600 meters / second – bullet speed;

m2 = 200 grams = 0.2 kilograms is the mass of a hockey puck.

It is required to determine v2 (meter / second) – what speed the washer must have in order to have an impulse equal to the impulse of the bullet.

By the condition of the problem, we have that the momentum of the bullet is equal to the momentum of the hockey puck:

p1 = p2;

m1 * v1 = m2 * v2;

v2 = m1 * v1 / m2;

v2 = 0.008 * 600 / 0.2 = 4.8 / 0.2 = 24 meters / second.

Answer: To have momentum equal to the momentum of a bullet, the hockey puck must move at a speed of 24 m / s.