Name: 1. A basketball is thrown into the basket, as shown in the diagram below. The ball leaves the player K hand at t= 0 s and reaches the basket at t= 3 s. Which of the following graphs best represents the ball's kinetic energy Ex as a function of time? A. B. Ek Ex t (s) t (s) C. D Ex t (s) t (s) 3 2 A 250 kg roller coaster passes point A at 12.0 m/s. A/K v = 12.0 m/s 18.0 m What is the speed of the roller coaster at point B at the bottom of the hill if 8 500 J of energy is transformed to heat during the journey? (7 marks)