## Answers

You have selected 0.2 m for the initial height and 1.1 m for the maximum height. That allows you to calculate the time the projectile must spend coming down (t2) and going up (t1).

(g/2) t2^2 = 1.1 m

t2 = 0.474 s

(g/2) t1^2 = 0.9 m

t1 = 0.429 s

Initial y component of velocity:

Vyi = g*t1 = 4.204 m/s

Total time of flight = 0.903 s

Vxi*0.903 s = 2.0 m

Vxi = 2.214 m/s

Vi = sqrt(Vxi^2 + Vyi^2) = 4.751 m/s

These two components determine the initial launch angle as

arctan(Vyi/Vxi) = 62.2 degrees.

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