A 10-kg shopping cart is rolling down the aisle at a rate of 2 m/s when it collides with a 20-kg shopping cart loaded with food that’s traveling in the same direction but at a rate of 1 m/s. If the first cart slows to 1.2 m/s after the collision, what is the speed of the 20-kg cart after the collision?

135 peaches were sold.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j