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Q.

A mass is moving with a speed of $5 m / s$ along the x-direction on a smooth surface when a force of $5 N$ acts on it along the y-axis. The work done by the force is

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a

25 J

b

10 J

c

Depends on the time

d

Zero

answer is D.

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Detailed Solution

The work done by the force is zero
As the force is acting perpendicular to the direction of motion, the work done will be zero.

W = F s cos θ

\Rightarrow W = F s cos 90 °

\Rightarrow W = F \times s \times 0

(as

\cos 90 ° = 0

)

\Rightarrow W = 0

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