60 ms-2
20 ms-2
15 ms-2
10 ms-2
Correct answer is B
The velocity V = 10 + 2t2
But acceleration, a = dv/dt
thus if V = 10 + 2t2
dv/dt = 4t
And t = 5s then a = 4x5 = 20m/s2
∴a = 20ms
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