[-/6 Points] DETAILS SCALCET8 3.7.007. The height (in meters) of a projectile shot vertically upward from a point 4 m above ground level with an initial velocity of 23.5 m/s is h = 4 + 23.5t - 4.9t after t seconds. (Round your answers to two decimal places.) (a) Find the velocity after 2 s and after 4 s. V (2 ) = m/s V ( 4 ) = m/s (b) When does the projectile reach its maximum height? c) What is the maximum height? m (d) When does it hit the ground? e) With what velocity does it hit the ground? m/s