Bob is pushing a box across the floor at a constant speed of 1 m/s, applying a horizontal force whose magnitude is 20 N. Alice is pushing an identical box across the floor at a constant speed of 2...

Bob is pushing a box across the floor at a constant speed of 1 m/s, applying a horizontal force whose magnitude is 20 N.

Alice is pushing an identical box across the floor at a constant speed of 2 m/s, applying a horizontal force.

(a) What is the magnitude of the force that Alice is applying to the box?

(b) With the two boxes starting from rest, explain qualitatively what Alice and Bob did to get their boxes moving at

different constant speeds.