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22-10-2021
Physics

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A 77 kg girl and a 62 kg boy face each other on friction free roller skates. The girl pushes the boy, who moves away at a speed of 2.5 m/s. What is the girl's speed?

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22-10-2021

Answer:

Explanation:

conservation of momentum

Initial momentum is zero

77v + 62(2.5) = 0

77v = -155

v = -155/77 = -2.0129870...

|v| = 2.0 m/s

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