A 5 kg box with initial speed 4 m/s slides across the floor and comes to a stop after 0.7 sec.
a. What is the coefficient of kinetic friction ?
b. How far does the box move ?
c. you put a 3 kg block in the box, so the total mass is now 8 kg, and you launch this heavier box with an initial speed of 4 m/s. How long does it take to stop ?