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A. Both hit the water at the same time. B. Both hit the water with the same impact speed.

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A. Both hit the water at the same time. B. Both hit the water with the same impact speed.

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  1. Two identical balls are thrown simultaneously at a speed of 20 m/s from the same height on a bridge over a lake. Ball A has an initial trajectory angle of 30° above the horizontal; Ball B has an initial trajectory angle of 30° below the horizontal. Both hit the water. Assuming no air drag (and constant g), what will you see? A. Both hit the water at the same time. B. Both hit the water with the same impact speed. C. Both reach the same maximum height. D. Both move the same horizontal distance before impact. E. More than one of the above. OSU PH 211, After Class #6

  2. Two identical balls are thrown simultaneously at a speed of 20 m/s from the same height on a bridge over a lake. Ball A has an initial trajectory angle of 30° above the horizontal; Ball B has an initial trajectory angle of 30° below the horizontal. Both hit the water. Assuming no air drag (and constant g), what will you see? A. Both hit the water at the same time. B. Both hit the water with the same impact speed. C. Both reach the same maximum height. D. Both move the same horizontal distance before impact. E. More than one of the above. (To see why this is the answer, calculate the velocity of Ball A at the moment when it has returned to its original height. How does this compare to Ball B’s starting velocity?) OSU PH 211, After Class #6

  3. (Try the “no-numbers” solution description method here first—then follow your own instructions to get a numerical answer.)You’re standing on a cliff 431 m above the water. You have a pellet gun that fires every shot with the same initial speed: 87.6 m/s.First, you fire shot A horizontally (i.e. at Ð0°) out over the water.2.50 seconds later, you fire shot B out over the water at an unknown angle (define straight upward = Ð90°; straight downward = Ж90°). A. Ð14.5° B. Ж18.3° C. Ж19.3° D. Not enough information. E. None of the above. If pellets A and B hit the water at the same moment, at what angle did you fire shot B? Model the pellets as projectiles (so neglect air drag), and assume a constant local g of 9.80 m/s2. OSU PH 211, After Class #6

  4. You’re standing on a cliff 431 m above the water. You have a pellet gun that fires every shot with the same initial speed: 87.6 m/s.First, you fire shot A horizontally (i.e. at Ð0°) out over the water.2.50 seconds later, you fire shot B out over the water at an unknown angle (define straight upward = Ð90°; straight downward = Ж90°). A. Ð14.5° B. Ж18.3° C. Ж19.3° D. Not enough information. E. None of the above. If pellets A and B hit the water at the same moment, at what angle did you fire shot B? Model the pellets as projectiles (so neglect air drag), and assume a constant local g of 9.80 m/s2. OSU PH 211, After Class #6

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