Problem 1. A tennis ball is connected to a light string and is swung at a uniform rate in a horizontal circle. In one trial, it moves at speed v

in a circle of radius r. In a second trial, it moves at a higher speed 3v in a circle of radius 3r. (a) In the second trial, its acceleration is (i) the same as in the first trial, (ii) three times larger, (iii) three times smaller, (iv) nine times larger or (v) nine times smaller. (b) In the second trial, how does its rotation period compare to the first trial? You may use the same choices as part (a). Explain your answers.