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Standard XII

Physics

Inertia

A body of mas...

Question

A body of mass $5 k g$ is moving with a constant velocity of $18$ $m / s$ on a friction less horizontal surface. The force required to keep this body moving with the same velocity is

5 N

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45 N

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90 N

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0 N

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Solution

The correct option is C $0 N$
Acceleration of the body must be zero i.e $a = 0$ because it is moving with constant velocity.
Acceleration of the body $a = \frac{F}{m}$
$∴$ $a = 0$ $⟹ F = 0$ N

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A body of mass 5 kg is moving with a constant velocity of 18 m/s on a friction less horizontal surface. The force required to keep this body moving with the same velocity is

The correct option is C 0NAcceleration of the body must be zero i.e a=0 because it is moving with constant velocity.Acceleration of the body a=Fm∴ a=0 ⟹F=0 N

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The correct option is C $0 N$
Acceleration of the body must be zero i.e $a = 0$ because it is moving with constant velocity.
Acceleration of the body $a = \frac{F}{m}$
$∴$ $a = 0$ $⟹ F = 0$ N