5. To compare the kinetic energies of two objects, you must know a. their masses d. the forces acting on them b. their velocities e. the work done to stop each of them . their momenta Problem Solving (Show all your work. 5 marks each.) 1. A billiard ball collides with an identical stationary billiard ball causing the balls to travel out with speeds of 3.0 m/s and 4.0 m/s at 90 to each other as shown below. Calculate the initial speed of the moving billiard ball 3.0 m/s 4.0 m/s 2. A 0.40-kg cue ball makes a glancing blow to a stationary 0.30-kg billiard ball so that the cue ball deflects with a speed of 1.2 m/s at an angle of 30.0 from its original path. Calculate the original speed of the cue ball if the billiard ball ends up travelling at 1.5 m/s