A Tennis Serve.? In the fastest measured tennis serve, the ball left the racquet at 73.14 m/s. A served tennis ball is typically in contact with the racquet for 30.0 ms and starts from rest. Assume constant acceleration. (a) What was the ball’s acceleration during this serve? (b) How far did the ball travel during the serve?

Solution 22E Step 1 The acceleration of an object is given by Where v and v are the final and initial velocities and t is the time interval during which the change in f i velocity occurs. In the given problem we have v = 0 m/s, v = 73.14 m/s and t = 30.0 ms = 30.0 × 10 3 s i f So, using the above equation we can write that Hence the acceleration of the ball during serve is 2438 m/s . 2