For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records data in the table shown above. Which of these best explains the student’s data? A. The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and the ramp.
B. The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity.
C. The speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are unbalanced.
D. The speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced.

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.