A resuce ship spots a plane crash survivor 60m high on a cliff that is 250m (horizontally) from the ship. If they went to launch a small bundle with a radio and basic supplies, and the launcher is set at 40 degrees with respect to horizontal, how fast should they launch the bundle? Assume no air resistance.

Question

anonymous · Answer

we have to hit the point x = 250m, y=60m 

y = v sin(40) t - 0.5 (9.8) t^2

x = v cos(40) t

get time to cliff, t = 250/ v cos(40)

put that t into y formula, set y = 60 and solve

I got v = 59.0 m/s initial velocity

t= 5.5s

and hit the spot (within rounding errors)

anonymous · Answer

danke

anonymous · Answer

bitte...but check my calculations!

anonymous · Answer

well do auf Wiedersehen