Correct Answer: Option B

Explanation

K.E = ¹/₂MV²
Force, F = ma => a = ^F/_m = ¹²/₄ = 3ms^-2
But a = (V-U) / t => V = u + at
If the initial velocity U = 0, then V = at = 3 x 3 = 9ms^-2
∴ K.E, = ¹/₂ms^-2
1/₂ 4 x 9 x 9 = 162J

There is an explanation video available below.

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