You and your friend are racing 15 kg shopping carts. You start off at 2 m/s but have to work your way up to 11 m/s in order to beat his pace. As you are running, you apply 40 N of force on the cart. For how long do you have to apply force to get to the speed you need?

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?