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    chempro's Avatar
    chempro Posts: 2, Reputation: 1
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    #1

    Sep 18, 2007, 11:54 PM
    projectile (sort of)
    a test rocket is fired vertically from a well. A catapult gives it initially velocity 80.0 m/s at ground level. Its engines then fires and it accelerates upwards at 4.00m/s ^2 until it reaches 1000m. At this point its engines fail and the rocket goes into free fall with an acceleration of -9.80m/s ^2.

    a. how long is the rocket above the ground?

    b. what is the maximum altitude?

    c. what is the velocity just before it collides with the earth?

    I don't understand what is happening in this question.!

    but I found time it to to get to 1000m (I got 10s). Then I found time it was in free fall (I got 14.2s) add time together to get total time above ground. It that correct? Then I do not know wehe to go from here.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Sep 18, 2007, 11:55 PM
    How far have you gotten? We're here to help you not do it for you :)
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