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Standard XII

Physics

Elastic Potential Energy

A boy pulls a...

Question

A boy pulls a 5 kg block along a 20 m long horizontal surface at a constant velocity by applying a horizontal force $F$ . If the coefficient of kinetic friction is 0.2, how much work does the boy do on the block? ( $g = 10 m s^{- 2}$ )

100 J

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300 J

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200 J

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400 J

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Solution

The correct option is B 200 J
$W = F \times S$ (F is parallel to S)
Since velocity is constant, total force is zero.
$F = μ m g$
$∴ F = 10 N$
$W = 10 \times 20 = 200 J$

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A boy pulls a 5 kg block along a 20 m long horizontal surface at a constant velocity by applying a horizontal force F. If the coefficient of kinetic friction is 0.2, how much work does the boy do on the block? (g=10 ms−2)

The correct option is B 200 JW=F×S (F is parallel to S)Since velocity is constant, total force is zero.F=μmg∴F=10NW=10×20=200J

A boy pulls a 5 kg block along a 20 m long horizontal surface at a constant velocity by applying a horizontal force $F$ . If the coefficient of kinetic friction is 0.2, how much work does the boy do on the block? ( $g = 10 m s^{- 2}$ )

The correct option is B 200 J
$W = F \times S$ (F is parallel to S)
Since velocity is constant, total force is zero.
$F = μ m g$
$∴ F = 10 N$
$W = 10 \times 20 = 200 J$