On a straight, level, two-lane road, two cars moving in opposite directions approach and pass each other. Car A is in the eastbound lane moving with a speed of 11 m/s, and Car B is in the westbound lane moving with a speed of 31 m/s. (a) What is the magnitude and direction of the velocity of car A as seen by the driver of car B?

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