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ch04_p31 39 - 31 We adopt the positive direction choices...

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31. We adopt the positive direction choices used in the textbook so that equations such as Eq. 4-22 are directly applicable. The coordinate origin is at the end of the rifle (the initial point for the bullet as it begins projectile motion in the sense of § 4-5), and we let θ 0 be the firing angle. If the target is a distance d away, then its coordinates are x = d, y = 0. The projectile motion equations lead to d = v 0 t cos θ 0 and 0 0 0 1 2 2 = v t gt sin θ . Eliminating
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