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14 January, 09:39

An object is dropped from a height of 25 meters. at what velocity will it hit the ground? a 7.0 m/s b 11 m/s c 22 m/s d 49 m/s e 70 m/s

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  1. 14 January, 11:57
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    Assuming that the object starts at rest, we know the following values:

    distance = 25m

    acceleration = 9.81m/s^2 [down]

    initial velocity = 0m/s

    we want to find final velocity and we don't know the time it took, so we will use the kinematics equation without time in it:

    Velocity final^2 = velocity initial^2 + 2 * acceleration * distance

    Filling everythint in, we have:

    Vf^2 = 0^2 + (2) (-9.81) (-25)

    The reason why the values are negative is because they are going in the negative direction

    Vf^2 = 490.5

    Take the square root of that

    Final velocity = 22.15m/s which is answer c
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