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21-11-2022
Physics

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a 60-kg man holding a 20-kg box rides on a skateboard at a speed of 7 m/s relative to the ground. he throws the box behind him. immediately after being released, the box is seen moving in the opposite direction to the skateboard at a speed of 5 m/s relative to the ground. what is the skateboard's speed relative to the ground after the man throws the box?

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