The drag on a pitched baseball can be surprisingly large. Suppose a 145 gram baseball with a diameter of 7.4 cm has an initial speed of 40.2 m/s (90 mph). a) What is the magnitude of the ball’s acceleration due to the drag force? b) If the ball had this same acceleration during its entire 18.4m trajectory, what would its final speed be?

Sam has a mass of 116kg, he attempts to see how high he can jump by performing a standing high jump. At the instant of takeoff (when he is no longer in contact with the ground) his vertical velocity is 3.7m/s and his center of gravity is 1.1 m high. a) what is Sam's vertical acceleration at the instant of takeoff? b) how much time elapses after takeoff until Sam reaches his highest peak? c) what peak height does Sam center of gravity achieve?

You are the physics consultant working on an action movie set where an SUV must start from rest, accelerate along a pier, and jump over a stretch of water to land in a departing ferry. (The director assures you it will all be very exciting.) The drawing below shows the situation.  The SUV has four-wheel drive (see problem N5D.1), and the coefficients of friction between the tires and the pier’s surface are us =3/4 and uk = 1/2. Calculate the length L (as a fraction or multiple of D) of the run along the pier that you will need for the SUV to make it to the ferry. Ignore air drag.

A 91 kg janitor wearing running shoes is running across an ice rink at a speed of 3.2 m/s. They try to stop abruptly, but keep sliding across the surface of the ice. The ice exerts a frictional force of 13.4 N to slow them down. How far do they travel before halting to a stop?