JEE Advanced2013PhysicsWork, Power and EnergyActual
A particle of mass 0.2 kg is moving in one dimension under a force that delivers a constant power 0.5 W to the particle. If the initial speed in ms -1 of the particle is zero, the speed in ms -1 after 5 s is
Correct answer
5
Step-by-step solution
Power = constant = 0.5 w work done w = pt = 0.5 × 5 = 2.5 J w = Δ k.E = 1 2 m v 2 2.5 = 1 2 × 0 · 2 v 2 5 0.2 = v 2 v 2 = 2 5 v = 5