P. 4372. Two trolleys of mass 2 kg, lying along a line, are at rest on a horizontal tabletop. On one of them there is a spring as well as shown in the figure. The trolley on the left is given an initial speed of 5 m/s, and it collides with the other one on the right. What is the energy stored in the spring when it is the shortest?
Deadline expired on 10 November 2011.