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4 October, 17:21

A Knight of the Round Table fires off a vat of burning pitch from his catapult at 15.9 m/s, at 30 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s2. How long is it in the air?

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  1. 4 October, 19:13
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    We can determine the time in the air by the initial vertical velocity component Vyo. To get the Vyo this is the formula;

    Vyo = 15.9 sin (30)

    Vyo = 7.95 m/s

    So, the initial vertical velocity component vyo is 7.95 m/s

    Vy becomes zero at

    t = Voy/g

    t = 7.95 m/s / 9.8 m/s^2

    t = 0.81 s

    It is 0.81 s long that the catapult is in the air.
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