Science physics

A boy stands on the roof of a 50m tall building and thrown a ball horizontslly at 20m/s away from the building.

How far away from the foot of the building will the ball land?

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  1. the free fall equation is
    ... h = -4.9 t^2 + 50

    set h = 0 and solve for the flight time

    multiply the flight time by 20 m/s to find the impact spot

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  2. I got an answer of 63.8m is it correct

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  3. to three figures ... 63.9

    do you use significant figure rules?

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