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Posted by on Friday, March 15, 2013 at 6:20pm.

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 91.9 m/s2 for 1.53 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) will the rocket reach?

  • physics - , Saturday, March 16, 2013 at 12:19am

    First calculate the burnout velocity (Vbo) and altitude (Hbo).
    Vbo = a*t = 91.9*1.53 = 140.6 m/s
    Hbo = (a/2)t^2 = 107.6 m
    The additional distance Hco that the rocket coasts upward can be calculated assuming conservation of energy.

    g*Hco = Vbo^2/2
    Hco = 1008.6 m
    Hmax = Hbo + Hco

    Constant rocket mass is being assumed.

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