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Unformatted text preview: 48 .0 m/s. It
accelerates with a constant upward acceleration of 1 .94 m/s2 until its engines stop at an altitude
of 132 m. (a) What is the maximum height reached by the rocket? (b) How long after lift oﬀ
does the rocket reach its maximum height? (c) How long is the rocket in the air?
Problem 7: Two cars are traveling along a straight line in the same direction, the lead car at
24 .2 m/s and the other car at 30 .5 m/s. At the moment the cars are 41 .9 m apart, the lead
driver applies the brakes, causing her car to have an acceleration of −2 .08 m/s2 . (a) How long
does it take for the lead car to stop? (b) What is the distance it travels during this time? (c)
Assuming that the chasing car brakes at the same time as the lead car, what must be the chasing
car’s minimum negative acceleration so as not to hit...
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