Solve this:

​Q17. Velocity of a particle moving along a straight line varies with time as shown in the adjacent figure. Net forces acting on the particle are F1 , F2 , F3 , F4 , and F5 in the intervals OA , AB , BC, CD and DE respectively. Identify the correct statement
                             
(a) F1 increased with time.

(b) F5 is initially positive and then becomes negative

(c) F1 and F2 are in opposite directions

(d) F3 is negative.

Hi,
If acceleration caused by F1 is considered +ve, the acceleration caused by F2 is negative from the graph.Therefore  F1 and F2
are in opposite direction.
So option c is correct

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