Problem: Which of the following is an inertial reference frame?Check all that apply.a) a reference frame that is moving downward at a constant speedb) a reference frame that is motionlessc) a reference frame that is rotating at a constant speedd) a reference frame that is moving upward at a constant speed

An inertial frame of reference can either be at rest or moving with constant velocity. As such, the net force acting on the frame is zero.

Which of the following is an inertial reference frame?

Check all that apply.

a) a reference frame that is moving downward at a constant speed

b) a reference frame that is motionless

c) a reference frame that is rotating at a constant speed

d) a reference frame that is moving upward at a constant speed