You are analyzing the flight of a projectile through the air. what assumption do you have to make in order to use conservation of mechanical energy in your analysis?

Explanation:

Assumptions in a projectile motions are mainly three and they are as following :

1. Acceleration due to gravity is constant throughout the travel period and always directed downward.

2. the medium of projectile motion is assumed to be non resistive that is air resistance is considered.

3. Moreover, the rotation of earth on its axis  does not affect the motion.

6 cos 34, 6 sin 34 trig

a and c

c is 100% but i am confused in a