Question 13 [1 point) An apple is connected to a string as shown. The apple moves downward from position A with a speed v0 Traveling on a circular path, the apple stops at position B. What enables the apple to reach point B, which is above point A? Ignore friction and air resistance. O 1) The hall's initial kinetic energy 0 2) The work done by the tension in the string 0 3) The work done by the gravitational force 0 4) The hall's initial gravitational potential energyr Question 14 (1 point) If the speed of an object is tripled and the mass is halved, by what factor does the kinetic energy change? Question 15 (1 point) which ofthe following is NOT a unit ofenergy? O 1) ws 0 2) kW-h O 3) kg 1112,352