A projectile is fired from a gun in the air and has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively. Determine the initial speed of the projectile. At what angle is the projectile fired (measured with respect to the horizontal)? What is the speed of the projectile when it is at the highest point in its trajectory? What is the acceleration of the projectile when it reaches its maximum height? What is the magnitude of the projectile's velocity just before it strikes the ground.