12. Suppose the gliders in the diagram above have masses m, = 0.383 kg and m, = 0.249 kg. The heavier glider, moving to the right with speed 0.293 m/s, overtakes the lighter one, which is moving to the right with speed 0.185 m/s. The gliders collide and separate. After the collision, the lighter glider is moving to the right with speed 0.254 m/s. Find the velocity of the heavier glider after the collision. Is the collision elastic or inelastic? (0.248 [right]), (inelastic) Else: = 8.9 x 10* J. 13. A 0.225 kg ball moves with a velocity of 0.30 m/s to the right. This ball collides with a 0.125 kg ball moving in the same direction at a velocity of 0.10 m/s. After the collision the velocity of the 0.125 kg ball is 0.24 m/s to the right. a. What is the velocity of the 0.225 kg ball after the collision? (0.222 m/s right) b. Is this an elastic or inelastic collision? Provide proof. (inelastic - energy lost = 1.61 x 10= J) C. What happened to the energy lost? 14. A truck of mass 3000 kg, moving at 5.0 m/s on a level, icy road, bumps into the rear of a car moving at 2.0 m/s in the same direction. After the impact the truck has a velocity of 3.0 m/s and the car a velocity of 6.0 m/s, both forward. a. What is the mass of the car? [1.5 x 10: kg] b. Calculate the total kinetic energy before and after the collision. [4.1 x 10* J and 4.1 x 10- ]] C. Is the Collision elastic or inelastic? Elastic 15. A 0.168-kg hockey puck flying at 45.0 m/s [252.] is trapped in the pads of an 82.0-kg goalie moving at 0.200 m/s [O.]. The velocity of the centre of mass of the goalie, pads, and puck immediately after collision is 0.192 m/s [333.]. Was the collision elastic? If not, calculate the percent of total kinetic energy retained. [inelastic, 0.882%] 16. A 15.0 kg object is moving east at a velocity of 7.0 m/s when it collides with a 10.0 kg stationary object. After the collision the 15.0 kg object is traveling at a velocity of 4.2 m/s 20.0- S of E. a. What is the velocity of the 10.0 kg object after collision? (5.1 m/s 25- N of E) b. Is this an elastic or inelastic collision? (E, loss = 1.1 x 10: J inelastic)