What must be true of any hypothesis? a
b
It must be proven correct.
It must be testable.
It cannot be based on observation.
It must provide the answer to a scientific question.
С
d

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.