Asked by Anonymous

A model rocket is launched straight upward with an initial speed of 50m/s. It acccelerates with a constant upward acceleration of 2m/s^2 until its engines stop at an altitude of 150m. (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?
Answered by bobpursley
a) find the velocicy due to the acceleration at the shutoff h=150m. Using that velocity, find the max height (when vfinal=0).
b)how long does it take to reach 150m? Then, how much longer to the top?