Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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# Problem P. 4372. (October 2011)

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?

(3 pont)

Deadline expired on November 10, 2011.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás. $\displaystyle \frac{1}{4}mv^2=12{,}5~$J.

### Statistics:

 215 students sent a solution. 3 points: 110 students. 2 points: 23 students. 1 point: 61 students. 0 point: 9 students. Unfair, not evaluated: 12 solutions.

Problems in Physics of KöMaL, October 2011