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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
Smooth plane has negligible friction
∴ only the resultant of the perpendicular forces is acting on the body, which is given as
F =
√ 82 + 62
=
√ 64 + 36
=
√ 100
= 10N
But F = Ma
∴ a = F/M = 10/4 = 2.5 ms-1