Two shells are fired from a cannon with a speed u each, at angles of α α and β β , respectively, to the horizontal. The time interval between the shots is T. They collide in mid-air after time t from the first shot. Which of the following conditions must be satisfied?
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For two shells to collide in air, they must reach the same point in the same time. First shell is fired at α α angle and has a longer time of flight t. The second fixed at β β has less time of flight as β β > α α , ∴ ∴ b and d are correct.
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