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WAEC Physics 2020 Paper

Question : 26

Total: 51

Solution:

Concept:

The component of the ball’s weight acting down the plank is

mg\sin\theta

The applied force

F

acts up the plank, opposing this motion.

Explanation:

The net force along the plank is the difference between the downward weight component and the opposing force

F

Therefore,

F_{\text{net}} = mg\sin\theta - F.

This matches option C.

Answer:

C. $mg\sin\theta - F$

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