Question

In the absence of an external force, a moving object will...

a) stop immediately.
b) slow down and eventually come to a stop.
c) gradually speed up until it reaches its terminal velocity.
d) move with constant velocity in a straight line.
e) move with constant velocity in a circular orbit.

Answer 1

In the absence of an external force, a moving object will move with a constant velocity in a straight line.

This is according to Newton's first law of motion that states: An object continues to be  in its state of rest or uniform motion and in the same direction not unless acted upon by an external force to change that state.