What is the minimum speed the rock must have, when it leaves the sling to travel exactly 400 m?(adsbygoogle = window.adsbygoogle || []).push({});

The only equation I can think of using is...

y = (tan(theta initial))x - (g/(2Vx0^2)x^2

y = 0

x = 400

However I have to many unknowns... I need to solve for V but I dont know Vx0 or Vy0 or the initial angle...

Help would be appreciated... thank you.

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# Finding minimum velocity.

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