An object moving on a frictionless horizontal road with a

Last updated: 8/2/2022

An object moving on a frictionless horizontal road with a constant speed of 40 m/s decreases to 15 m/s 5 s after entering a road where the friction force is constant. If the mass of the object is 4 kg, what is the friction force acting on the object, in N'? A) 10 B) 15 C) 20 D) 25 E) 30