[size=100]A particle moves s along a straight line and passes through a fixed point O. Its velocity, v ms[sup]-1[/sup] is given by v=[math]mt^2+nt[/math], where m and n are constants and t is the time, in seconds, after passing through O. It is given that the particle stops instantaneously when t = 5 s and its acceleration is 3 ms[sup]-2[/sup] when t=1s.[/size][br][size=100][Assume motion to the right is positive][br][br]Find[br][/size]