Bob is pushing a box across the floor at a constant speed of 1.7 m/s, applying a horizontal force whose magnitude is 61 N. Alice is pushing an identical box across the floor at a constant speed of 3.4 m/s, applying a horizontal force. (a) What is the magnitude of the force that Alice is applying to the box? F = N (b) With the two boxes starting from rest, explain qualitatively what Alice and Bob did to get their boxes moving at different constant speeds. Each initially applied a force bigger than static friction to get the box moving and accelerating, then when the desired final speed was achieved they reduced the force to make the net force zero. O In order to keep the box moving twice as fast, Alice had to apply a constant force that was twice as large as the force that Bob applied. Part 1 (a) What is the coefficient of kinetic friction? i Save for Later Part 2 (b) How far does the box move? distance = i Save for Later E (c) You put a 4.3 kg block in the box, so the total mass is now 11.6 kg. and you launch this heavier box with an initial speed of 6.6 m/s. How long does it take to stop? At = S