A rocket blasts off and moves straight upward from the launch padwith constant a

Question

A rocket blasts off and moves straight upward from the launch padwith constant acceleration. After 3.4s the rocket is at a height of 90.0 m. (a) What are the magnitude and direction of therocket’s acceleration?
Magnitude 1 m/s2 Direction 2---Select---upwarddownward
(b) What is its speed at this time?
3 m/s (a) What are the magnitude and direction of therocket’s acceleration?
Magnitude 1 m/s2 Direction 2---Select---upwarddownward
(b) What is its speed at this time?
3 m/s Magnitude 1 m/s2 Direction 2---Select---upwarddownward

Explanation / Answer

2) s = 1/2 at2 (+ v0t which is 0)(+ s0 which is 0)
So, using equation (2) we have 90 = 1/2 a (3.4)2; a = 90 * 2 / 11.56 = 15.57m/sec2. The direction is straight upward
Using a and t in (1) gives us v = 15.57 * 3.4 = 52.94 m/sec

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