Answer to Question #76579 in Physics for River

Question

A bobsled leaves a horizontal track with a speed of 30. m/s. It then moves onto a horizontal track lightly sprinkled with sawdust and comes to a stop in a distance of 150 m. Find the coefficient of friction between the runners of the sled and the sawdust-covered surface.

Answer 1

From the conservation of energy:
(mv^2)/2=μmgd
μ=v^2/2gd
The coefficient of friction:
μ=〖30〗^2/(2(10)(150))=0.3.