Which statement describes a characteristic of an experimental design that will improve the quality of the results?
A. It has a small sample size of test subjects,
B. It has more than one manipulated variable,
C. It has a single responding variable,
D. It involves a procedure that is complex,

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?