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Byju's Answer

Standard XII

Physics

Work Energy Theorem Application

A body of mas...

Question

A body of mass $2 k g$ is projected with an initial velocity of $5 m s^{- 1}$ along a rough horizontal table.The magnitude of work done on the body by the frictional forces before it is brought to rest is:

- 250 J

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- 2.5 J

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- 10 J

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- 25 J

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Solution

The correct option is D $- 25 J$
Work done by frictional force
$= Δ (K . E)$

$= \frac{1}{2} m (v^{2} - u^{2})$

$= \frac{1}{2} \times 2 \times - 25$

$= - 25 J$

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Similar questions

Q. A body of mass

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A body of mass 2 kg initially at rest moves under the action of an applied horizontal force of 7 N on a table with coefficient of kinetic friction = 0.1.

Compute the

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A body of mass 2kg is projected with an initial velocity of 5 ms−1 along a rough horizontal table.The magnitude of work done on the body by the frictional forces before it is brought to rest is:

The correct option is D −25JWork done by frictional force=Δ(K.E)=12m(v2−u2)=12×2×−25=−25J

A body of mass $2 k g$ is projected with an initial velocity of $5 m s^{- 1}$ along a rough horizontal table.The magnitude of work done on the body by the frictional forces before it is brought to rest is:

The correct option is D $- 25 J$
Work done by frictional force
$= Δ (K . E)$

$= \frac{1}{2} m (v^{2} - u^{2})$

$= \frac{1}{2} \times 2 \times - 25$

$= - 25 J$