momentum = 66*7.8
average force = change in momentum/time
= -66*7.8/.95 Newtons
acceleration = average force/ 66
friction force = average force
= mu m g
so
mu = |acceleration|/g
A student with a mass of 66kg is rollerblading at a velocity of 7.8m/s[W] when the trail suddenly becomes very rough and as a result the student stops pushing and comes to a stop in 0.95s.
Determine the net force and acceleration of the student on the rough trail.
Calculate the coefficient of kinetic friction between the rollerblades and the rough trail.
1 answer
1 answer