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21 September, 20:59

A swan on a lake gets airborne by flapping its wings and running on top of the water. If the swan must reach a velocity of 6.00 m/s to take off and it accelerates from rest at an average rate of 0.350 m/s2, How long does this take (in seconds)

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  1. 21 September, 21:13
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    A. 51.42 m.

    B. 17.14 s.

    Explanation:

    Using equations of motion:

    vf^2 = vi^2 + 2 * aS

    Where,

    vf = final velocity

    a = acceleration

    S = distance to which swan traveled

    vi = 0 m/s

    6.00^2 = 2 * 0.350S

    S = 36/0.7

    = 51.42 m.

    B.

    vf = vi + at

    6 = 0 + 0.35t

    t = 6/0.35

    = 17.14 s.
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