A student launches a small rocket which starts from rest. At a height of 1.4km,

Question

A student launches a small rocket which starts from rest.  At a height of 1.4km, the rocket has reached a velocity of Vf=278 m/s.

h=1.4km

Vf=278 m/s

What was the rockets acceleration, a1 (in m/s^2), during this period. Assume constant acceleration.

After the rocket motor shuts off, the craft begins to fall. What is the rockets acceleration during this period, a2 (in m/s^2)

What is the numeric value of the total height traveled by the rocket in meters?

Please show work, I want to know how to do this.  Thank you!

Explanation / Answer

h=1.4km

Vf=278 m/s

What was the rockets acceleration, a1 (in m/s^2), during this period. Assume constant acceleration

(v^2/2h) =

=278^2/2 x1400) =

27.60 m/sec^2

B) a = -g = -9.8 m/sec

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