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17 November, 13:09

A projectile is launched vertically at 100 m/s. If air resistance can be ignored, at what speed will it return to its initial level?

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  1. 17 November, 13:14
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    Speed with which it return to its initial level is 100 m/s

    Explanation:

    We have equation of motion v² = u² + 2as

    Initial velocity, u = 100 m/s

    Acceleration, a = - 9.81 m/s²

    Final velocity, v = ?

    Displacement, s = 0 m

    Substituting

    v² = u² + 2as

    v² = 100² + 2 x - 9.81 x 0

    v² = 100²

    v = ±100 m/s

    +100 m/s is initial velocity and - 100 m/s is final velocity.

    Speed with which it return to its initial level is 100 m/s
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