Ahorse canters away from its trainer in a straight line, moving 160m away in 17s. it then turns abruptly and gallops halfwayback in 6.8s. calculate the (a) its average speed and (b) its average velocity for the entire trip, using "away from the trainer"as the positive direction.

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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