3, 4. (a) If two objects With non-zero mass and non-zero velocity have equal momentum and equal kinetic energy, what can you conclude about their velocities? (b) Can you draw any conclusion about their masses? Explain your answer, (A-2,c-2) An object of mass m: = 2.5 kg has a one-dimensional collision with another object of mass = 7.5 kg, as shown in Figure 1, Their initial speeds along x are v: = +6.0 m/s and = -15 m/s. The two objects stick together after the collision. Calculate the velocity after the collision. (a) (b) '12 = 15m/s = 6.0 m/s = 2.5 kg - 10 kg = 7.5 kg Figure 1