Correct Answer: Option A

Explanation

Mean acceleration = \(\frac{\Delta V}{\Delta t}\)

Point 1: (2s, 5m/s) 
Point 2: (4s,15m/s)

Mean acceleration = \(\frac{ 15 - 5 }{4 - 2}\) =  5.0ms\(^2\)

There is an explanation video available below.

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