Question

an object moving in a positive direction with positive acceleration will
be balanced
not move
slow down
speed up
a book measures 2.5 cm. two students measure the book three times and get the following results:
student 1:
2.5 cm
2.0 cm
2.5 cm
student 2:
2.0 cm
2.0 cm
2.0 cm
which of the following are true?
check all that apply.
student 1 is most accurate
student 1 is most precise
student 2 is most accurate
student 2 is most precise

Explanation:

First Question (Motion with Acceleration)

To determine the motion of an object with positive velocity and positive acceleration, we use the concept of acceleration as the rate of change of velocity. When velocity and acceleration have the same sign (both positive here), the object's speed increases. So, the object will speed up.

• Accuracy: How close measurements are to the true value (2.5 cm). Student 1 has measurements (2.5, 2.0, 2.5) with two values at 2.5 cm (close to true value), while Student 2’s measurements (2.0, 2.0, 2.0) are all 0.5 cm away from 2.5 cm. So Student 1 is more accurate.
• Precision: How close measurements are to each other. Student 2’s measurements are all 2.0 cm (very consistent), while Student 1’s measurements vary (2.5, 2.0, 2.5). So Student 2 is more precise.

Answer:

D. speed up

Second Question (Accuracy and Precision)