From a stationary boat, weighing 80 kg, a boy jumps to the shore.

From a stationary boat, weighing 80 kg, a boy jumps to the shore. The boy’s weight is 40 kg, his jump speed is 2 m / s. How fast will the boat get?

From a stationary boat, weighing 80 kg, a boy jumps to the shore. The boy’s weight is 40 kg, his jump speed is 2 m / s. How fast will the boat get?

Given: m1 = 80, m2 = 40, v2 = 2 m / s, v1-?

Solution:

According to the law of conservation of momentum m1 * V1 = m2 * V2

V1 = (m2 * v2) / m1 = (40 * 2) / 80 = 1 m / s

Answer: boat speed 1 m / s



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