Physics

Problem

A projectile crosses two walls of equal height

h = 15\,\text{m}

t_{1} = 1\,\text{s}

and

t_{2} = 3\,\text{s}

after projection. Determine the initial vertical velocity and the angle of projection if the horizontal range is

80\,\text{m}

. Take

g = 10\,\text{m/s}^{2}