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What is the force needed to be applied upwards along the plane to make the box either remain stationary or just move up with uniform speed ?
What is the force needed to be applied upwards along the plane to make the box either remain stationary or just move up with uniform speed ?

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The correct Answer is:
Force needed mg `(sin alpha + mu cos alpha)`
Force needed = mg `(sin alpha + mu cos alpha)ma.`
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CBSE COMPLEMENTARY MATERIAL-NEWTON'S LAWS OF MOTION-3 Marks Questions & Numericals
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