A conveyor belt is moving at a constant speed of 2 m s-1 . A box is gently dropped on it. The coefficient of friction between them is μ = 0.5. The distance that the box will move relative to belt before coming to rest on it, taking g = 10 ms-2,is
(a) 0.4 m
(b) 1.2 m
(c) 0.6 m
(d) zero
