JEE Main Physics question
At t = 0 s a particle starts moving along the x-axis. If its kinetic energy increases uniformly with time t, the net force acting on it must be proportional to
Answer: (D)
Solution
K ∝ t ⟹ ½mv² ∝ t ⟹ v ∝ √t. The net force F = m(dv/dt) ∝ d(√t)/dt ∝ 1/√t.