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a 42.0 kg projectile is launched horizontally from the top of a cliff, 50 meters above...

a 42.0 kg projectile is launched horizontally from the top of a cliff, 50 meters above the ground. the projectiles initial speed is 30 m/s.
use g=10m/s^2
A)What is the projectiles inti kinetic energy?
B)What is the projectiles total mechanical emergy the moment is launch?
C)What is the projectiles initial gravitational potential energy?
D)if air resistance and other forms of friction are negligible, the projectile speed as it flies to the ground. As this happens, the kinetic energy will ____________, the grabitational potential energy will ____________, and the total mechanical energy will_________.
E) The projectiles height is approximately zero the moment before it hits the ground. what will be its velocoty at this moment?
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