two cars with a giant springs toward each other. The first car is 1000kg traveling at an unknown velocity.  The second car weighs 1500kg and is traveling at -45m/s.  if the final velocity is 1000kg the car is -25m/s and the final velocity of the 1500kg car is 20m/s what is the initial velocity of the 100kg car?

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2