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Answer:
a person jumping on a trampoline
Step-by-step explanation:
We expect a runner to hit the ground at each step, so their height will be zero at some point. We expect a height curve to have a flat bottom, where the height is zero for the duration of the time that each foot is on the ground.
A person on a trampoline will remain above ground, and will come to a gentle stop before being re-launched into the air. The curve seems to represent ...
a person jumping on a trampoline
