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BITSAT 2020

Exam: BITSAT
Year: 2020
Subject: Physics
Chapter: Work, Power and Energy

BITSAT 2020 · Physics · Work, Power and Energy

A boy pushes a toy box 2.0 m along the floor by means of a force of...

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

Options

A $6 \mathrm{ J}$
B $8 \mathrm{ J}$
C $10 \mathrm{ J}$
D $12 \mathrm{ J}$

Correct answer

C. $10 \mathrm{ J}$

Step-by-step solution

\mathrm{W}=\mathrm{F} \mathrm{s} \cos \theta=10 \times 2 \cos 60^{{}^{\circ}}=10 \mathrm{ J}

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