Question

A sling shot shoots pellets at 50 m/s.Find two angles of elevation that can be used to hit a target 55 m away? Assume the gravitational constant g=10m/s^2.

Answer 1

0 = (1/2) (-10) t^2 + 50sin(theta)t, where t = 55/[50cos(theta)]

solution: (with POSITIVE time value)
https://www.wolframalpha.com/input/?i=0+%3D+%281%2F2%29%28-10%29t%5E2+%2B+50sin%28theta%29t+%2C+t+%3D+55+%2F+%2850+cos%28theta%29%29%2C+t%3D0..10

Answer 2

the angles are in radian, so you can convert to degrees

Answer 3

sorry, wrong like:
here is the right one:
https://www.wolframalpha.com/input/?i=0+%3D+%281%2F2%29%28-10%29t%5E2+%2B+50sin%28theta%29t+%2C+t+%3D+55+%2F+%2850+cos%28theta%29%29