1) g) h) If a car starts at rest, and takes a certain power. P, to accelerate to a certain velocity v, how much power would it take to accelerate to 2v in the same amount of time? If the momentum is tripled, by what factor does its kinetic energy change? A heavy object and a light object, both starting from rest are pushed along a frictionless oor for the same distance. How does their momentum and kinetic energy compare? A 2.0 kg ball moving east at 11 m/s collides elastically with a 1.5 kg ball moving 15 m/s west. What is each of their speeds after the collision? A baseball with a mass of 145 grams is moving horizontally at a speed of 35 m/s when it strike a bat which causes it to move straight up vertically with a speed of 45 m/s. If the club was in contact with the ball for 1.0 ms. what was the impulse provided to the ball by the bat, and what was the average force of the bat on the ball? In the battle of Gettysburg, the gunre was so intense that several bullets were found that had collided in midair and fused together. Suppose a 5.00-g Union musket ball was moving to the right horizontally at a speed of 250 m/s 200, and that a 3.00g Confederate ball was moving to the left at a speed of 280 m/s, 250 above the horizontal. If the two bullets collide and fuse together, (a) what is their velocity right after the collision. and how much kinetic energy was lost in the collision. A golf ball is red at a bowling ball, initially at rest. After the collision, the golf ball bounces back with nearly the same speed as it was originally moving. How did the momentum change of the golf ball compare with the momentum change of the bowling ball and which has a greater momentum after the collision? In a ballistic pendulum, a 52-gram projectile is red into a 0.48 kg block. The bullet and block swing like a pendulum and rise to a height of h = 9.8 cm above the original position. How fast was the bullet originally moving? Calculate the center of mass of the system of particles shown in the diagram