A 2.0 m long conical diffuser 20 cm in diameter at the upstream end has 80 cm diameter at the downstream end. At a certain instant the discharge through the diffuser is observed to be 200 litres/sec of water and is found to increase uniformly at a rate of 50 litres/sec. Estimate the local, convective and total acceleration at a section 1.5 m from he upstream end.