Which of the following statement is false?   i. In an elastic collision, KE is conserved. ii. Momentum will be conserved in a two body collision only if the net external force acting on the two body system is zero. iii. The KE of each body before and after collision is same in an elastic collision. iv. The KE is not conserved in an inelastic collision,   All except i   ii only   iii only   iii and iv

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