Gon a one-mile circular automobile race track, 30 drivers are each instructed to drive one lap (i. e., one mile) at 60 mph, the next lap at 90 mph, and then continue to alternate between lap speeds of 60 and 90 mph for a very long period of time. to visualize this system, you might imagine that the cars are inserted onto the race track in such a way that cars in each speed class maintain nearly uniform spacings over the track. determine

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.