Correct Answer: Option A

Explanation

Smooth plane has negligible friction
∴ only the resultant of the perpendicular forces is acting on the body, which is given as
F = \(\sqrt{ 6^2 + 8^2}\)
 

= \(\sqrt{64 + 36}\)


= \(\sqrt{100}\)

= 10N
But F = Ma
∴ a = F/M = 10/4 = 2.5 ms-1

There is an explanation video available below.

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