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Question

A 60 kg man holding a 20 kg box rides on a skateboard at a speed of 7 m/s. He throws the box behind him, giving it a velocity of 5 m/s. with respect to the ground. What is his velocity after throwing the object?
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A
8 m/s
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B
9 m/s
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C
10 m/s
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D
11 m/s
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E
12 m/s
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