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Sagot :
Answer:
that the acceleration is negative therefore it is directed to the left.
Explanation:
To find the acceleration of a system we must use Newton's second law
∑ F = m a
To apply this equation to our case we set a reference system where the direction to the right is positive.
We have 3 forces, a force F₁ = -20 N, a negative sign indicates that it is directed to the left, two forces F₂ and F₃ of magnitude 8N each directed to the right.
We substitute
-F₁ + F₂ + F₃ = m a
- 20 +8 + 8 = m a
-4 = m a
a = -4 / m
Here we can see that the acceleration is negative therefore it is directed to the left.
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