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JEE Main 2026 Apr 5 Shift 2, Physics Q3: Work Energy Theorem And Its Applications

JEE Main2026Apr 5, Shift 2Physics
Q.

A mass of 1 kg kept on an inclined plane with 30° inclination with respect to the horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of 4 m/s. The work done by the frictional force in time 2s is _____ J. (Take m/s)

  1. A

    20

  2. B

    25

  3. C

    30

  4. D

    10

Solution

Since the block is at rest on the incline, friction balances the component of gravity along the incline:

N, directed up the incline.

The whole assembly moves vertically upward by m. The angle between the friction force (along the incline, upward) and the vertical displacement is .

J.

Concept behind this question

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