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mafiozo [28]
4 years ago
15

Ques

Physics
1 answer:
Amanda [17]4 years ago
4 0

Answer:

When a particle or a system of particles move in a system where no external force acts, then the total linear momentum of the particle system remains constant.

Explanation:

Given data:

Total mass of the skateboarder, m_{1} = 70 \ kg

Mass of the friend, m_{2} = 50 \ kg

Initial velocity of the skateboarder, u_{1} = 3 \ m/s

Initial velocity of the the friend, u_{2} = 0

Let the new velocity of the skateboarder when his friend jumps be v.

From the conservation law of linear momentum,

m_{1}u_{1} + m_{2}u_{2} = (m_{1} + m_{2})v

70 \times 3 + 50 \times 0 = (70 + 50)v

\Rightarrow \ v &= 1.75 \ m/s.

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