Having rolled down the hill on a snow-scooter, the boy drove 12.5 m along a horizontal snow platform in 5 seconds.

Having rolled down the hill on a snow-scooter, the boy drove 12.5 m along a horizontal snow platform in 5 seconds. What are the sliding friction force and the coefficient of sliding friction of the snow-scooter’s skis on the snow, if the weight of the boy together with the snow-scooter is 50 kg?

Decision:
ma = μmg; a = mg
S = at * 2/2 = μgt * 2/2; μ = 2S / gt * 2 = 2 12.5m / 10m / s * 2 (5 s) * 2 = 0.1
F = μmg = 0.1 50 kg 10 m / s * 2 = 50N
Answer: F = 50H, μ = 0.1