An object slides on a level surface in the +x direction. It slows and comes to a stop with a constant acceleration of -2.45 m/s². What is the coefficient of kinetic friction between the object and the floor?
0.25.
4.9
Impossible to determine without knowing the mass of the object
0.50.
A 10-kg box sitting on a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the object?
0.30 m/s².
0.50 m/s².
5.0 m/s².
0.20 m/s².
