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22 March, 13:46

A volcano launches a lava bomb straight upward with an initial speed of 28m/s. Taking upward to be the positive direction, find speed and direction of motion of the lava bomb. a) 2.0seconds and b) 3.0seconds after it is launched

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  1. 22 March, 16:36
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    The equation to be used here would be:

    v = u - gt

    where u is the initial speed, g is the acceleration due to gravity and t is the time it takes

    a) u = 28 m/s, g = 9.8 m/s^2, t = 2s

    v = 28 m/s - 9.8 m/s^2 * 2s = 8.4 m/s after 2 s the lava bomb is still travelling upwards

    b) u = 28 m/s g = 9.8 m/s^2 t = 3s

    v = 28 m/s - 9.8 m/s^2 * 3s = - 1.4 m/s after 3s the lave bomb is travelling downwards
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