A 2.00-kg projectile is fired vertically upward with an initial velocity of 98.0 m/s. Find its kinetic energy, its potential energy, and the sum of its kinetic and potential energies at each of the following times:
(a) The instant of its being fired
(b) t = 1.00 s
(c) t = 2.00 s
(d) t _ 5.00 s
(e) t = 10.00 s
(f) t = 12.00 s
(g) t = 15.00 s
(h) t = 20.00 s