1- A shopper pushes a grocery cart 18,75 m on level ground, against a 46,15 N frictional force. The cart has a mass of 10,87 kg. He pushes in a direction 26,94 below the horizontal. If the initial velocity was 1,65 m/s, and final speed was 18,76 m/2. What is the work done by the pushing force in units of Joules?

2- A 40,31-kg skier with an initial speed of v_i=36,95 m/s coasts up a H=19,61-m-high rise with a slope angle theta=22,59. What is her final speed at the top? Assume the coefficient of kinetic friction between her skis and the snow is 0,090. Use g = 10 m/s².