The fastest server in women's tennis is Sabine Lisicki, who recorded a serve of 131 mi/hmi/h (211 km/hkm/h) in 2014. Suppose that the acceleration of the ball was constant during the contact with the racket. What was the time interval for the racket-ball contact?

A car is initially traveling at a rate of 65 feet per second. The acceleration of the car is 3 feet per second squared. Determine the displacement of the car at time t if the displacement at t=5 seconds is 29 feet. Do not include "s(t)=" in your answer.

In a slap shot, a hockey player accelerates the puck from a velocity of 7.5 m/s to 41 m/s in one direction.  If this shot takes 3.12 × 10-2 s, calculate the distance, in meters, over which the puck accelerates. d =

An unidentified flying object (UFO) is observed to travel a total distance of 42000 m, starting and ending at rest, over a duration of 2.07 s. Assuming the UFO accelerated at a constant rate to the midpoint of its journey and then decelerated at a constant rate the rest of the way, what was the magnitude of its acceleration? Express your answer in g s , where 1 g = 9.81 m/s^2.     39,207 g s     19,604 g s     3,997 g s     1,998 g s

A person hits a trampoline while moving downward with a speed of 9 m/s and rebounds a short time later with roughly the same speed upward. If the person is in contact with the trampoline for about 1.8 s, what are the magnitude and direction of the person’s average acceleration during this time interval? (Hint: You can ignore the effects due to gravity

A driving instructor reports that crashing a car at 30 mi/hmi/h is equivalent to dropping the car from a height of just over 40 feet. Calculate the drop height corresponding to the crash. Express your answer using two significant figures.

A car, moving to the left in a straight line in the negative x-direction, travels a distance d = 32 m during time interval Δt = 18 s. What is the value of the x-component of the car's average velocity, in m/s, during the given time interval?