# Physics

A projectile is fired with an initial velocity of 300m/s.upward at an angle of 30 degree with horizontal from a point 80m above the level plain. What horizontal distance will it cover before it strikes the plain?

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1. vertical problem first

h = Hi + Vi t - 4.9 t^2

0 = 80 + 300 (sin 30) t - 4.9 t^2

solve quadratic for t. Use positive t, the other root was on the way up underground.

then
Horizontal problem at constant u = 300 cos 30
d = u * t

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