Help with 3,4

A force of 40.0 N is applied to a rope that makes an angle of 60.0' to the horizontal. An object attached to the rope moves horizontally along a frictionless surface a distance of 5.00 m. How much work is done? A. 50.0 J B. 100 J C. 200 J D. 400 J OA OB OC OD Question 4 Two carts, each with a spring bumper, collide head-on. At one point during the collision, both carts are at rest for an instant. At that instant, the kinetic energy that the carts originally possessed is almost completely A. lost to friction B. transformed into heat and sound C. converted into kinetic energy in the spring bumpers D. converted into potential energy in the spring bumpers