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A car whose mass is 725 kg moves to the east at 15 m/s. What is the magnitude and direction of the momentum of the car? If a second car of mass 2175 kg had the same momentum as the previous car, what would its velocity be? A 0.144 kg baseball is pitched at 38 m/s It is hit by the bat and moves at the same speed but in the opposite direction. Draw a before and after picture. What is the impulse? If the contact time is 8 x 10-4 s, what force did the bat exert? A billiard ball with a mass of 0.195 kg and a velocity of 0.850 m/s to the right is deflected by the cushioned edge of the billiard table. The cushion exerts a force of 3.50 N to the left for 0.0750 s. What is the ball’s final velocity? A rock with m = 17000 kg slides with a speed of 25 m/s (assume friction is negligible). The rock suddenly explodes into 2 pieces, one piece with mass = 9,000 kg moves in the positive x-direction with v = 14 m/s. What is the velocity of the second piece? A 2 g bullet w/ v1 = 538 m/s strikes a 0.25 kg piece of wood on a frictionless surface. The bullet remains in the wood. What is the final speed of the bullet-block? A 2275 kg car going 28 m/s rear ends a 875 kg car going 16 m/s in the same direction. If the two cars stick together how fast does the wreckage move after the collision? Ball A with m = 15 kg and initial velocity of 3.5 m/s to the right collides elastically with a second ball. Ball B has a mass of 22 kg and initial velocity of 4 m/s to the left. If Ball A has a final velocity of 5.4 m/s to the left, what is the final velocity of Ball B? Colliding Trains vf= ? Colliding Trains (in-elastic) Before m1 = 18,000 kg v1i = 8 m/s After m2 = 24,000 kg v2i = 0 m/s Boy and a girl ice skaters collide and embrace in a collision. The boy whose mass is 35 kg is originally moving east w/ v = 6.2 m/s. The girl whose mass is 22 kg is originally moving north w/ v = 7.8 m/s. What is the v of the pair after the collision? What is their direction? Ball A is 2 kg and is moving to the right at 5 m/s. It elastically collides with stationary ball B (same mass). After the collision, ball A moves at 30° above the horizontal with a velocity of 4.33 m/s, while ball B moves at an angle below the horizontal. What is the vf of Ball B?