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Let's continue after lecture4 Jet strikes with moving flat plate  let us consider a plate which is free to move linearly with velocity 'U'. Point 1 represent the entry point of Jet on plate. Point 2 represent exit point of jet on Above and below ends of the plate. 'U1' represent velocity of entry point of plate and 'U2' represent velocity of exit point of plate. When Jet strikes the plate, it will move in linear direction so here U = U1 = U2. Now in these cases concepts of relative velocity will be used. V1 represents velocity of jet at entry with respect to ground. Remember one thing that any relative term which is represented with respect to ground are absolute term. So here V1 is also called as absolute velocity of jet. Similarly U is also called as absolute velocity of plate because U is velocity of plate with respect to ground. V2 represents velocity of Jet at exit with respect to ground and it is also called as absolute velocity of Jet at exit