A body of mass $M$ is moving with a uniform speed of $10 m / s$ on a frictionless surface under the influence of two forces $F_{1}$ and $F_{2} .$ The net power of the system is

10 F_{1} F_{2} M

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10 (F_{1} + F_{2}) M

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(F_{1} + F_{2}) / M

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z e r o

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Solution

The correct option is D $z e r o$
The body is moving with uniform speed, $V = 10 m / s$ which implies acceleration is zero. (as $a = (\frac{d V}{d t}) = (\frac{d}{d t}) (c o n s t a n t) = 0$ )

The body is under two forces $F_{1} & F_{2}$

As $F = m a$ , net force applied on body $F = m (0) = 0$

Power =Force $\times$ velocity.

Hence, Power $= 0$ .

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