A box is pulled across a frictionless floor at <strongconstant velocity</strong by a horizontal rope tension of 50\text{N} over 3\text{m}. The work done by the rope on the box is

150\text{J} Tension is along motion: W = F d = (50)(3) = 150\text{J}. (Frictionless and constant velocity means another force, e.g. fluid drag here would not exist; or the rope balances motion already begun.)

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Acemy

Work and Mechanical Energy

AP Physics 1· difficulty 2/5

50~\text{N}

A
$150~\text{J}$
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B
$50~\text{J}$
C
$100~\text{J}$
D
$0$

Explanation

W = F d = (50)(3) = 150~\text{J}

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