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find initial vertical velocity and final vertical velocity when a ball has a mass of 280g, flight time of 0.69s and has a length of 0.76m. height of strike is 0.8m.

this is a projectile motion question. i'm a little bit stuck since it doesn't give angle - thanks

Kemal Celik
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  • Do my homework ? – keoxkeox Mar 01 '18 at 09:50
  • Please remember that you can choose an aswer among the given is the OP is solved, more details here https://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work – user Mar 09 '18 at 22:45

1 Answers1

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HINT

From the following

  • $ x = v_0 t \cos(\theta)$
  • $y = v_0 t \sin(\theta) - \frac{1}{2}gt^2$

set

  • $y_{max} = v_0 (\bar t/2) \sin(\theta) - \frac{1}{2}g(\bar t/2)^2$
  • $ x_{max} = v_0 \bar t \cos(\theta)$

from which find $\theta$ and $v_0$.

user
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