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# Vectors, velocity & mass: Speed of six model rockets

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Six model rockets (ABCDEF) have just had their engines turned off. All of the rockets are aimed at the same angle, but their speeds differ. All of the rockets are the same size and shape, but they carry different loads, so their masses differ. (Their respective masses are listed below.) At the instant when the engines are turned off, the rockets are all at the same height. Rank the rockets based on the horizontal speed at the maximum height. List them in order of increasing horizontal speed, from smallest to largest. (E.g., if B is smallest, then A,C,D and finally E is largest, enter BACDE. If they are all of equal speed, then enter in the order listed.)

A: v = 20 m/s, m = 500 g
B: v = 55 m/s, m = 700 g
C: v = 45 m/s, m = 600 g
D: v = 40 m/s, m = 400 g
E: v = 60 m/s, m = 600 g
F: v = 55 m/s, m = 400 g