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19 September, 21:24

challenge: A 3 kg model airplane is traveling at a speed of 33 m/s ... The operator then increases the speed up to 45 m/s in 2 seconds. How much force did the engine need in order to make this change?

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  1. 19 September, 22:57
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    The average force exerted on an object is given by the equation:

    F = Δp/Δt = mΔv/Δt = m (Vf-Vi) / Δt

    F is the average force, m is the object's mass, Vi is the object's initial velocity, Vf is the object's final velocity, and Δt is the time elapsed.

    Given values:

    m = 3kg

    Vi = 33m/s

    Vf = 45m/s

    Δt = 2s

    Plug in the values and solve for F:

    F = 3 (45-33) / 2

    F = 18N
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