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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

Consider the following statements A and B and identify the correct answer given below. [EAMCET 2003] (A) A body initially at rest is acted upon by a constant force; the rate of change of its kinetic energy varies linearly with time. (B) When a body is at rest, it must be in equilibrium.

Answer: (C)

Solution

For constant force F on a body starting from rest, dK/dt = Fv = F(at) ∝ t, so (A) is correct. A body can be momentarily at rest

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Question ID VK-153626