Question 20 Answer and Explanation _ACT April 2019 Form Z15 Science Section

20. In a new set of 10 trials performed on the dry road, the vehicle with System Z was accelerated to 60 m/sec with no cargo. To calculate B, the following equation was used:

$B=\frac{{(60\,m/sec)}^{2}}{2*S}$

The average B for this set of trials was 10.0 $m/{sec}^{2}$ . Was the average S more likely less than 45.1 m or greater than 45.1 m ?

F. Less; a vehicle decelerating at the same rate from a lower speed requires less distance to come to a stop.

G. Less; a vehicle decelerating at the same rate from a higher speed requires less distance to come to a stop.

H. Greater; a vehicle decelerating at the same rate from a lower speed requires more distance to come to a stop.

J. Greater; a vehicle decelerating at the same rate from a higher speed requires more distance to come to a stop.

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

According to Step 1 in Study 1, it can be seen that the initial velocity in the original experiment was 30 m/s, but in the question stem, the initial velocity was increased to 60 m/s. As the initial velocity increases, the braking distance becomes longer

Study 3 System X was installed in a compact car, a sedan, a minivan, and a truck. The procedures for determining aver­age S in Study 1 were then repeated for each vehicle, with­out cargo, on both the dry and wet roads (see Figure 1).

Study 3
System X was installed in a compact car, a sedan, a minivan, and a truck. The procedures for determining average S in Study 1 were then repeated for each vehicle, without cargo, on both the dry and wet roads (see Figure 1).