Answer:
+300N-130N=170N
Explanation:
because two forces in opposite direction one take +and the other takes -
Explanation:
The ball, for example, will feel gravity pulling it downward and the ground pushing it upward in the direction it is rolling. (Add this if the ball is rolling on the floor.) Friction is the force that causes the ball to slow down because it acts in the opposite direction that it is moving.
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There doesn't seem to be any direct connection.