15 A particle, \(P\), is moving in a straight line with acceleration \(a \mathrm {~ms} ^ { - 2 }\) at time \(t\) seconds, where
$$a = 4 - 3 t ^ { 2 }$$
15
- Initially \(P\) is stationary.
Find an expression for the velocity of \(P\) in terms of \(t\).
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