Mathematical and Physical Journal
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# Problem P. 4378. (October 2011)

P. 4378. In a particle accelerator a charged particle was accelerated to a speed of 80% of the speed of light. What will its speed be if it is further accelerated and its kinetic energy is doubled?

(4 pont)

Deadline expired on November 10, 2011.

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

Megoldás. A fénysebesség $\displaystyle \frac{\sqrt{40}}{7}$-szerese, vagyis kb. 90 százaléka.

### Statistics:

 132 students sent a solution. 4 points: 70 students. 3 points: 8 students. 2 points: 26 students. 1 point: 5 students. 0 point: 22 students. Unfair, not evaluated: 1 solutions.

Problems in Physics of KöMaL, October 2011