11. A coin is dropped from the Taft Bridge, 2500 feet above the Roosevelt River. The coin's height (in feet) above the river t seconds after it is dropped is given by H(t) = 2500 - 16t2 . (a) Find the coin's height above the river at t = 10 seconds. (b) Find the coin's velocity at t = 10 seconds. (c) Find how many seconds it will take for the coin to hit the water. (d) Find the coin's velocity as it strikes the water