Help with 1,2,3,4

1. A force of 40.0 N is applied to a rope, which makes an angle of 60.0 degrees 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) 200 J (B) 100 J (C) 400 J (D) 50.0 J 2. On the box of 4 soft white, 100-watt light bulbs, it states that each bulb has an average life of 788 h. How much energy is used by each light bulb to equal its average life? (A) 7.88 X 104 J (B) 2.84 X 108 J (C) 4.73 X 106 J (D) 2.84 X 106 J 3. A 2.0 kg rock is thrown vertically upward from a 50 m cliff with an initial velocity of 6.0 m/s and reaches a maximum height of 80 m. Which of the following statements is false? (A) The mechanical energy of the rock at its maximum equals the mechanical energy at the ground level. ) The potential energy of the rock at the top is greater than the kinetic at the top. (C) The kinetic energy of the rock as it reaches the ground is greater than the potential energy at the ground. (D) The potential energy of the rock is at its greatest just before it is thrown. 4. Homer walks 4.00 m up a flight of stairs while carrying a 15.0 kg bag of groceries. How much work did Homer do? a. 15.0 J b. 60.0 J C. 147 J d. 589 J