Answer:
Either C or D(probably D(
Explanation:
the reasoning for this is that the bounce duration and bounce height can only be altered by altering other factors. we know that something would bounce less on cotton then it would on concrete so the surface its bounced on has to be an independent variable, it can be changed and doing so will change other factors. secondly, The height its bounced from can directly be changed and dropping it higher will increase bounce height and bounce duration. Third, how long it bounces is unclear but it most likely refers to the amount of time that passes before it stops bouncing, from this i know that it will be influenced by multiple things such as surface or weight however option D seems more correct then option c. option D states that the dependant variable is bounce height, we know that the more height a falling object has, the more kinetic energy it will aquire, when this ball hits the surface its energy is transferred to the surface and then back to the ball, this process however its not 100 % efficient and the amount of energy loss is dependant on the material, a harder surface will transfer more energy back to the ball while a softer one will not. Hope this helps please tell me if im wrong!!!!!!!
