Answer:
C.) Gravity
Explanation:
The projectile is an object upon which the only force is gravity. Gravity acts to influence the vertical motion of the projectile.
The physical properties that can be used to identify an
unknown material are the ability to rust, malleability and thermal
conduction. The answers are letters A, B and D. Weight cannot be used to
identify an unknown material.
They are, in fact termed: Body Waves.