reasoned question about newton's law... please help!?

Linda (:

New member
Hello!! im currently seeing newton's laws in class, but my professor thinks we already know these things, but certainly we dont , so im begginn you please help!.

It exerts a horizontal force to keep a body moving with constant velocity on a horizontal surface. In analyzing this experience in light of the laws of motion, the conclusion is accepted that:
a)Should exist other horizontal force that opposes the motion
b) The only horizontal force should be the one that causes the movement
c)The vertical forces can not be in equilibrium
d) The horizontal forces can not be in equilibrium

any help would be appreciated, thanks :)
 
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