Mass of the ball, m = 0.5 kg

Initial height = 30 m

Final height = 20 m

Contact time, t = 2 ms = 2 x 10^-3 s

Velocity during descent, V1 = `sqrt(2gh) = sqrt(2xx9.81xx30) = 24.3 m/s`

Velocity during ascent,...

(The entire section contains 102 words.)

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