An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at +35 ft/s2. After some time t1, the rocket engine is shut down and the sled moves with constant velocity v for a time t2. If the total distance traveled by the sled is 16050 ft and the total time is 90 s. Find the following. (a) The times t1 and t2. t1 t2 (b) The velocity v. ft/s At the 16050 ft mark, the sled begins to accelerate at -19 ft/s2. (c) What is the final position (measured from back where it started) of the sled when it comes to rest? ft (d) How long does it take (from when it first started) to come to rest