# A body weighing 0.8 kg moves at a speed of 2 m / s and collides with a stationary body weighing 0.6 kg.

December 31, 2020 | education

| **A body weighing 0.8 kg moves at a speed of 2 m / s and collides with a stationary body weighing 0.6 kg. After after the collision, they began to move as a whole. Determine the speed of the bodies after interaction.**

We use the law of conservation of momentum:

m1 * v1 + m2 * v2 = m1 * V1 + m2 * V2

from the conditions of the problem:

v1 = 2 m / s

v2 = 0

V1 = V2 = V

then:

m1 * v1 = (m1 + m2) * V

0.8 * 2 = (0.8 + 0.6) * V

V = 1.6 / 1.4 = 1.143

V = 1.143 m / s – speed of bodies after interaction

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