In the Force lab, we use a small lab car with mass m=5 Kg, the
experiment is on a horizontal table, on the car is acting a pulling
force F= 20 N and the kinetic friction force Fr is acting as well.
The car initially is at rest, and take 6.0 seconds to reach the
velocity of 8.5 m/s.
a)
Calculate the magnitude of the friction force Fr acting on the
car?
b) We
remove the pulling force when the...