After the interaction, two bodies began to move at a speed of 1.5 m / s and 2.5 m / s.

After the interaction, two bodies began to move at a speed of 1.5 m / s and 2.5 m / s. Determine the mass of the second body if the mass of the first is 50g.

Given:

v1 = 1.5 m / s is the speed of the first body after interaction;

v2 = 2.5 m / s is the speed of the second body after interaction;

m1 = 50 grams = 0.05 kilograms – the mass of the first body.

It is required to determine the mass of the second body m2 (kilogram).

To determine the mass of the second body, you need to use the following relationship (the law of conservation of momentum):

m1 * v1 = m2 * v2;

m2 = m1 * v1 / v2 = 0.05 * 1.5 / 2.5 = 0.075 / 2.5 = 0.03 kilograms.

Answer: the mass of the second body is 0.03 kilograms (30 grams).