[size=100][b]A particle moves s along a straight line and passes through a fixed point O. Its velocity,v ms[sup]-1[/sup] [/b][b] is given by v=mt[sup]2[/sup]+nt,[/b][b] 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] [/b][b]when t=1s.[/b][br][/size][br][size=100][b][Assume motion to the right is positive][/b][br][br][b]Find[/b][br][/size]