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Lesson 7: ACT Science Mastery
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Lesson 7: ACT Science Mastery

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Passage

• Science students used 2 different methods to calculate the total stopping distance of a vehicle (Z). Z is the total distance a vehicle travels from the time the driver first reacts to the emergency all the way until the car comes to a complete stop.

In Method 1, X is the distance a car travels during the driver's assumed reaction time of 0.75

Method 2 simply assumes that Z is the initi speed in feet per second times 2 seconds. (Z = speed x 2). Table 1 shows X, Y, and Z for seve different initial speeds, where Z is calculated using both methods. Figure 1 is a graph of Z initial speed for Methods 1 and 2.

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• Slide 4
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• Question 5
45 seconds
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Q.

Per Method 1, what is the total stopping distance for a car with an initial speed of 25 mi/hr?

53 ft

72 ft

220 ft

359 ft

• Question 6
45 seconds
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Q.

Per Method 1, what is the total stopping distance for a car with an initial speed of 110 ft/sec?

220 ft

298 ft

110 ft

359 ft

• Question 7
45 seconds
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Q.

Per Method 2, what is the total stopping distance for a car with an initial speed of 100 mi/hr?

298 ft

562 ft

450 ft

112 ft

• Question 8
45 seconds
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Q.

Per Method 2, what is the total stopping distance for a car with an initial speed of 148 ft/sec