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p mv
6. A 0.5 kg blue dynamics cart is moving with an initial velocity of -2 m/s when it collides with a 0.25 kg red dynamics cart. The red cart is initially moving with a velocity of +4 m/s. As a result of the collision, the blue dynamics cart has a final velocity of +0.8 m/s. What is the final velocity of the red cart? 7. Starting from rest, a 1600 kg car is subject to a net force of 600 N for a time of 8 seconds. What is the final velocity of the car? 8. A 20 kg cannonball starting at rest is fired and emerges from the end of the barrel with a velocity of 80 m/s. If it takes the cannonball 0.25 s to emerge following the explosion, what is the net force acting on the cannonball? At an amusement park, a 200 kg bumper car is moving with an initial velocity of +8 m/s when it bumps into a second bumper car, whose mass is 220 kg, that has an initial velocity of +6 m/s. After the collision, the heavier bumper car has a velocity of +6.5 m/s. What is the final velocity of the lighter car? 9. 10. A 60 kg student sitting in a wheeled chair is holding a 2 kg textbook, initially at rest. If she throws the book away from her with a velocity of -6 m/s, what is the final velocity of the student? Assume frictional effects are negligible 11. A 0.6 kg softball is thrown with an initial velocity of +20 m/s into a cardboard box, that is initially at rest. If the softball stays in the box, and the box has a mass of 0.2 kg, what is the final velocity of the box and ball?
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