if we draw v-t graph for min time velocity first increses with slope 1 and achieve max velocity v then slows down with slope 3 total area = 1/2vt=1215 let accelating time = t1=v retarding time = t2=v/3 t=t1+t2=4v/3 puttin in eq 1 (1/2)(4v/3)v=1215 v=root(1215*3/2)=42.69 t=4v/3=56.92
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