Lesson 7: ACT Science Mastery

Lesson 7: ACT Science Mastery

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. 

  
  

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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

• 562 ft

• 298 ft

• 148 ft

• 450 ft