1) A box is pushed without acceleration 5.0 m along a horizontal floor against a frictional force of 180 N. How much work is done? 2) What work is performed in dragging a sled 50 ft horizontally without acceleration when the force of 60 lb is transmitted by a rope making an angle of 30 with the ground? 3) A 40 lb stone is carried up a ramp, along a path making 30 angle to the horizontal, to the top of a building 100 ft high. A) How much work is done? (Neglect friction) B) The distance traversed is now 200 ft, the force exerted on the stone is equal in magnitude to its weight. The angle between the force and the displacement is 60, what is the work done? 4) What is the kinetic energy of a 3000 lb automobile which is moving at 30 mi/h (44 ft/s)? 5) A 3000 lb automobile at rest at the top of an incline 30ft high and 300 ft long is released and rolls down the hill. What is its speed at the bottom of the incline if the average retarding force due to friction is 200lb? 6) What power is needed to move a 3000 lb car up an 8 incline with a constant speed of 50 mi/h against a frictional force of 80 lb