Tuesday
September 2, 2014

Homework Help: physics

Posted by blair on Thursday, October 8, 2009 at 10:51pm.

A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.8 m/s at ground level. Its engines then fire and it accelerates upward at 3.90 m/s2 until it reaches an altitude of 920 m. At that point its engines fail, and the rocket goes into free fall, with an acceleration of -9.80 m/s2. (You will need to consider the motion while the engine is operating separate from the free-fall motion.)
(a) How long is the rocket in motion above the ground?
__________s

(b) What is its maximum altitude?
_______km

(c) What is its velocity just before it collides with the Earth?
______m/s

Please explain this question and show what equations should be used ! Thanks!

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