Chapter 5: Exercises with Solutions

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526 <strong>Chapter</strong> 5 Quadratic Functions53. A penny is thrown downward fromthe top of a tree at an initial speed of16 ft/s. The tree is 68 feet tall. Howmany seconds will it take the penny tohit the ground? Round your answer tothe nearest hundredth of a second.54. A penny is thrown downward off ofthe edge of a cliff at an initial speed of32 ft/s. How many seconds will it takethe penny to fall 210 feet? Round youranswer to the nearest hundredth of a second.Version: Fall 2007
Section 5.5Motion5.5 <strong>Solutions</strong>1. We are trying to solve for d, so d = vt is the formula we want to use.d = vt= 30 mih × 5 h= 150 mi3. We are trying to solve for t, so divide d = vt by v on each side first.t = d v120 mi=30 mi/hr= 120 mi × 1 hr30 mi= 4 hrs5. We are trying to solve for v, so divide d = vt by t on each side first.v = d t250 mi=5 hrs= 50 miles per hour7. We are trying to solve for d, so d = vt is the formula we want to use. But noticethat the rate v is given in ft/s, while time t is given as 5 minutes. We must first makethe units match, so convertNow plug into the formula.t = 5 min= 5min × 60 s1 min= 300 sd = vt= 15 ft s × 300 s= 4500 ftVersion: Fall 2007
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Section 5.1 The Parabola 4335.1 Exe
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Section 5.1 The Parabola 435In Exer
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Section 5.1The Parabola5.1 Solution
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Chapter 5: Exercises with Solutions

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