The weight of an object is
a. the force of gravity on its mass.
b. the amount of matter in an object.
c. the tendency of an object to resist motion.
d. the tendency of an object to continue moving in a straight line.

The weight of an object is the force of gravity on its mass. The answer is letter A. The acceleration due to gravity is the acceleration on an object caused by force of gravitation. It means that the earth has a gravitational field that projects all bodies on earth towards its center. The gravity of an object or body of an object is high on earth than at the atmosphere. It has an average of gravitational constant equal to 9.8066 or 9.8 meters per second. In truth, the acceleration of the object depend upon its location, the latitude and altitude, on earth.     

unable to answer the rest since your question is incomplete

15.3 cos 65 degrees trig