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A boy pushes a toy box $2.0 \mathrm{~m}$ along the floor by means of a force of $10 \mathrm{~N}$ directed downward at an angle of $60^{\circ}$ to the horizontal. The work done by the boy is
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$10 \mathrm{~J}$
$\mathrm{W}=\mathrm{F} \mathrm{s} \cos \theta=10 \times 2 \cos 60^{\circ}=10 \mathrm{~J}$
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