A body with mass 2 kg moves in one direction in the presence of a force which is described by the potential energy graph. If the body is released from rest at x = 2m, then its speed when it crosses x = 5 m is

Question

G1 Physics · Accepted Answer

From the U-x graph, U(2 m)=6 J and U(5 m)=2 J. Released from rest, K(5)=U(2)-U(5)=4 J. With m=2 kg, ½mv²=4 gives v=2 m/s. Hence C.