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Make a table with x and y. Then replace the limits in the equation. e.g when x=-2, y=-4 and when x=4, y=-2. Then find the value of y for the critical value( it is the value of x for which the result INSIDE the modulus symbol is zero). In this case the critical value is x=2 and hence y=0. Now the...

practice makes perfect. Work out all the questions you see and do give sspecial consideration to relative velocity as it's highly probable you can get it for your exams