Physics!!!!
posted by Daisy .
A 78 kg trampoline artist jumps vertically upward from the top of a platform with a speed of 4.4m/s.
v=7.7m/s
If the trampoline behaves like a spring of spring constant 5.6×104 N/m , how far does he depress it?

Physics!!!! 
drwls
When does v = 7.7 m/s?
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