<h2>
The magnitude 24 (
) of the acceleration of the particle when the particle is not moving.</h2>
Explanation:
Given,
A particle moving along the x-axis has a position given by
m ........ (1)
To find, the magnitude (
) of the acceleration of the particle when the particle is not moving = ?
Differentiating equation (1) w.r.t, 't', we get

⇒
....... (2)
⇒ 
⇒ 
⇒ t = 2 s
Again, differentiating equation (2) w.r.t, 't', we get

Put t = 2, we get

Thus, the magnitude 24 (
) of the acceleration of the particle when the particle is not moving.
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A: 2 concrete blocks 6cm apart will have the least gravitational attraction to each other.
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Choice 'b' is one possible way to state
Newton's second law of motion.
The other choices are meaningless.