Two forces present in projectile motion are:

a. Gravity and acceleration

b. Gravity and initial forward velocity

c. Gravity and air resistance

d. Gravity and weak nuclear force

The two forces present in projectile motion are (c) gravity and air resistance. From the equations that can be formulated for projectile motion, gravity is present in it even in free-fall. While air resistance is present cause it is negative force that hinders an object to be projected.