A rocket is fired at a speed of 76.4 m/s from ground level, at an angle of 61.0° above the horizontal. The rocket is fired toward an 10.6 m high wall, which is located 26.2 m away. By how much does the rocket clear the top of the wall?

t = 26.2/76.4cos61

then put t into
y = 76.4cos61 * t