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In recent years the rapid development in telecommunication technologies leads to a non linear growth in the number of users of mobile electronic gadgets accessible to a communication network. These electronic gadgets are nothing but the nodes of the MANET (Mobile Ad hoc Network) and thus the mobility of the nodes effects a much the performance of the network. A change in mobility can be meant as the change in speed of node during motion in the network or pause time at different points during its motion between a source and destination point in the network. Due to change in mobility link between neighbour nodes can break a number of times as a result of which the performance of a network may be hampered. Also a number of packets may be dropped at different layers of the network. One of the way of analyzing the performance of a MANET is by considering the packet delivery fraction (PDF). This paper describes a detailed analysis of performance affected due to change in mobility in different terrain area. The parameter describing the reason of variation in performance is the number of packets delivered. The simulator we have used in our work for the calculation of performance matric is GLOMOSIM. The performance comparison has also made considering two types of routing protocols AODV and DSR.