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A boy pulls a 5 kg block 20 metres along...

A boy pulls a 5 kg block 20 metres along a horizontal sur- face at a constant speed with a force directed 45° above the horizontal. If the coefficient of kinetic friction is 0.20, how much work does the boy do on the block?

A

163.32 J

B

11.55 J

C

150 J

D

115 J

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