Question

which of the following scenarios is the direction fnet to the left

a. a box moving to the left at a constant speed
b. a box moving to the right and slowing down
c. a box moving to the right and constant speed
d. a box moving to the left and slowing down

Answer 1

The acceleration is not a zero, so f_net is not zero.
The direction f_net is opposite to the direction of velocity (leftwards).