What is the purpose of a free body diagram? to show the velocity of an object to show the acceleration of an object to show the forces acting on an object to show the direction of motion vectors of an object

Answer : Free body diagram is used  to show the forces acting on an object.

Explanation :

A free body diagram of a body is used to show all the forces acting, the direction and the resultant force. It is denoted as FBD.

For example,

In the attached figure, the forces acting on the block is shown. The forces acting on the block are frictional force, gravitational force and the normal force.

f is the frictional force

m is the mass of the block

g is the acceleration due to gravity.

Hence, then correct statement is " to show the forces acting on an object ".

a sonic boom is a loud boom that breaks the sound barrier

explanation: