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NTA Abhyas JEE Main2020PhysicsLaws of MotionPractice

A block is placed on an inclined plane moving towards right horizontally with an acceleration a 0 = g . The length of the plane A C = 1 m . Friction is absent everywhere. The time taken by the block to reach from C to A is: g = 10 m / s 2

Options

  1. A1.2 s
  2. B0.74 s
  3. C2.56 s
  4. D0.42 s

Correct answer

B. 0.74 s

Step-by-step solution

Drawing free body diagram of block with respect to plane. Acceleration of the block up the plane is a = m g c o s 30 - m g s i n 30 m = 3 - 1 2 g = 3.66 m / s 2 applying s = 1 2 a t 2 t = 2 s a = 2 × 1 3.66 = 0.74 s

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