1. A projectile is launched at an angle of 75° above the horizontal and strikes the ground downrange. For what other angle of launch at the same speed would this projectile land at the same distance?...

1. A projectile is launched at an angle of 75° above the horizontal and strikes the ground downrange. For what other angle of launch at the same speed would this projectile land at the same distance?

2. A projectile is launched vertically at 30 m/s. If air drag can be neglected, at what speed will it return to its initial level?