An object following a straight-line path at constant speed
A)has a net force acting upon it in the direction of motion.
B)has zero acceleration.
C)must be moving in a vacuum or in the absence of air drag.
D)has no forces acting on it.
E)none of the above

Question

Quizplus · Accepted Answer

An object moving in a straight line at a constant speed has zero acceleration because its velocity (speed and direction) is not changing. Acceleration is defined as the rate of change of velocity, so if velocity is constant, acceleration is zero.

An Object Following a Straight-Line Path at Constant Speed