Mathematical and Physical Journal
for High Schools
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# Problem P. 4176. (September 2009)

P. 4176. A child sitting on a sleigh slides along an inclined plane, which has an angle of elevation of 10o. There is a small forward wind which exerts a force of 10.5 N on the child in the direction of the motion. The total mass of the child and the sleigh is 65 kg, and the coefficient of kinetic friction between the sleigh and the snow is 0.15.

a) If the sleigh starts from rest swat will the final speed of the sleigh be at the end of the 125 m long inclined plane?

b) How long does it take for the sleigh to reach the bottom of the inclined plane?

(4 pont)

Deadline expired on October 12, 2009.

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

Megoldás. $\displaystyle a)$ 10 m/s

$\displaystyle b)$ 25 s

### Statistics:

 287 students sent a solution. 4 points: 240 students. 3 points: 6 students. 2 points: 21 students. 1 point: 11 students. 0 point: 8 students. Unfair, not evaluated: 1 solution.

Problems in Physics of KöMaL, September 2009