Astudent wishes to study the effect of proper hydration on the performance of her school's track team.
the dependent variable will probably be

Performance

Explanation:

An independent variable varies in the experiment. This variable can be changed manually to observe it's impact over the experimental variable or dependent variable. The dependent variable is the outcome of the experimental process.  

In the given study, the effect of the proper hydration is the independent variable which can be observed on the performance. The performance is the dependent variable.

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

it is called kinetic energy