At the Earth's surface a 800 kg projectile is launched straight up at a speed of 9.00 km/s. Ignore air resistance and the rotation of the Earth a. What is the projectile's total mechanical energy at Earth's surface? J b. What is the projectile's maximum height (measured from the Earth's surface)? km c. How much work was done by the gravitational field as the projectile moved from the surface to its maximum height? J d. True/False: The projectile's maximum height depends on the projectile's mass? True