rLeylmarjulia rLeylmarjulia

12-12-2016
Mathematics

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What speed must you toss a ball straight up so that it takes 4 s to return to you? Show your work.

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Edufirst Edufirst

13-12-2016

1) Type of motion: constant acceleration.

2) acceleration, a = 9.8 m/s^2

3) time up = time down = 4seconds / 2 = 2 seconds

4) formula = Vf = Vo - a*t^2/2

Vf = 0 => Vo = a*t^2 / 2 = 9.8m/s^2 * (2 s)^2 / 2 = 19.6 m/s

Answer: 19.6 m/s

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