# ws03 - Worksheet 3 Two-dimensional motion I(Projectile...

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Worksheet 3: Two-dimensional motion I (Projectile motion) Questions 1. Consider a projectile at the top of its trajectory (a) The total speed is v 0 cos θ 0 (vertical component of velocity is zero). (b) The acceleration is vectora = - g ˆ y (c) The accleration is perpendicular to the velocity 2. Consider two footbal trajectories (a) The flight times are equal (they go the same height above the ground). (b) The vertical component of the launch velocity is the same for A and B, because they go the same height into the air. (c) The horizontal component of the launch velocity is greater for B, it goes further in the same amount of time. (d) The launch speed of B is greater parenleftBig | vectorv 0 | = radicalBig v 2 x + v 2 y parenrightBig 3. Identical guns are fired on the Earth and the moon from the same height. (a) True: Since g moon is smaller, it will take more time to travel the same vertical distance: Δ y = - 1 2 gt 2 (b) True: As mentioned before, the bullet on the moon travels longer.

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