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A MANET (Mobile Ad hoc Network) is a wireless network which is mobile and is deployed for an immediate or short term purpose. MANETs operate by sharing information among its neighbours and each node in a MANET takes responsibility for information propagation since central coordination is absent. Hence, each node in a MANET implicitly trusts its neighbours for information sharing. Nodes in a MANET are vulnerable to various security threats which seek to exploit the weaknesses of the network. A Black Hole attack is one such attack which seeks to compromise the network by dropping information that is meant for a certain destination. This paper looks at utilizing the inherent trust relationship among the nodes in a MANET by formulating a trust model to recognize the trustworthiness of a node. This trust model makes use of intrusion detection to detect, identify and mitigate Black hole attacks.