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JEE Main202126 Feb 2021Evening ShiftPhysicsLaws of MotionActual

Two masses A and B , each of mass M are fixed together by a massless spring, A force acts on the mass B as shown in figure. If the mass A starts moving away from mass B with acceleration a , then the acceleration of mass B will be :

Options

  1. AM F F + M a
  2. BF + M a M
  3. CM a - F M
  4. DF - M a M

Correct answer

D. F - M a M

Step-by-step solution

a cm = m 1 a 1 + m 2 a 2 m 1 + m 2 F 2 M = M a + M a B 2 M a B = F - M a M

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