A 650 g hammer is moving horizontally at 9.00 m/s when it strikes a nail and comes to rest after driving the nail 5.00 cm into a board. Assume constant acceleration of the hammer-nail pair. a....

A 650 g hammer is moving horizontally at 9.00 m/s when it strikes a nail and comes to rest after driving the nail 5.00 cm into a board. Assume constant acceleration of the hammer-nail pair. a. Calculate the duration of the impact. b. What was the average force exerted on the nail?