An archer lines up an arrow on the horizontal exactly dead center on a target as

Question

An archer lines up an arrow on the horizontal exactly dead center on a target as down in Figure P4.70. She releases the arrow and it strikes the target a distance h = 7.5 cm below the center. If the target is 11 m from the archer how long was the arrow in the air before striking the target. Submit Answer Tries 0/5 What was the initial velocity of the arrow as it left the bow? Report your answers in meters per second, feet per second and miles per hour. Neglect air resistance. In meters per second Submit Answer Tries 0/5 In feet per second Submit Answer Tries 0/5 In miles per hour Submit Answer Tries 0/5

Explanation / Answer

ANS (a)

  An object takes time = 2h/g seconds to fall a distance = h
time = (2)(0.075)/9.81 = 0.123 s

ANS (b)
speed of arrow (assumed constant) = 7.5/0.123 =61 m/s

200.131234 feet/sec

136.453114 miles/hour

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