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12 September, 16:41

a 8.0 * 104 kg spaceship is at rest in deep space. it's thrusters provide a force of 1200 kn. the spaceship fires its thrusters for 20 s, then coasts for 12 km. how long does it take the spaceship to coast this distance?

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  1. 12 September, 20:39
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    40 seconds

    Explanation:

    Thrusting speed = V

    Where V=at

    a = F/m

    Therefore V = Ft/m

    F = 1200kN = 1200000N

    t = 20s

    m = 8.0 * 104 kg

    V = 1200000 * 20 / 80000

    V = 300m/s

    Time for the spaceship to coast a distance of 12km

    Distance = Vt

    t = 12000/300 = 40seconds
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