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P. 4629. An object is left to move along a horizontal surface, on which friction is not negligible. At one moment its kinetic energy is 900 J, and 2 s later it is only 400 J, while the object covers a distance of $\displaystyle \ell$.

$\displaystyle a)$ By what factor will the further distance until the object stops be greater than the distance $\displaystyle \ell$?

$\displaystyle b)$ How long does it take to cover this distance?

(4 points)

Deadline expired on 12 May 2014.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldásvázlat. $\displaystyle a)$ 0,8-szorosát.

$\displaystyle b)$ 4 s alatt.

Statistics on problem P. 4629.
 102 students sent a solution. 4 points: 72 students. 3 points: 11 students. 2 points: 8 students. 1 point: 10 students. 0 point: 1 student.

• Problems in Physics of KöMaL, April 2014

•  Támogatóink: Morgan Stanley