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An ice sled powered by a rocket engine starts from rest on a large frozen lake...

An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at +39 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 18,250 ft and the total time is 90 s, find the following.

(a) the times t1 and t2

t1 = ___ s

t2 = ____ s

(b) the velocity v

v = ____ ft/s

At the 18,250-ft mark, the sled begins to accelerate at −21 ft/s2.

(c) What is the final position of the sled when it comes to rest?

____ ft

(d) How long does it take to come to rest? (Give the amount of time after the sled begins to decelerate t3, and the time for the entire trip ttotal.)

t3 = ___ s

ttotal = ____ s

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Answer #1

newton law was used.

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