The diagram shows a projectile being launched at a velocity of 1.0 km s−1 at an angle of 30∘ to the horizontal. Assume that g = 9.8 m s−2 and that air resistance is negligible. a What is the time of flight of the projectile? b What is the speed of the projectile at its maximum height? c Determine the acceleration of the projectile 1.0 s after it is launched.