Which of the following is least likely to be a scientific experiment? a. leo places one plant in direct sunlight and two others in the shade. he observes them for 10 days. b. carmen changes the weight on the end of a pendulum. she notes each time how long it takes the pendulum to cycle. c. byron checks the ph level in 10 water samples. he maps the reading to the location where he took the sample. d. emma trims the stems of a bouquet of flowers. she places the flowers in a vase on the dining table.

D should be the answer

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.