Question: A person performs a vertical jump by first moving downwards ( countermovement ) then pushing and moving explosively upwards. Assuming that the upward vertical direction

A person performs a vertical jump by first moving downwards

(

countermovement

)

then pushing and moving explosively upwards. Assuming that the upward vertical direction is positive, what is his vertical acceleration, in terms of positive, negative, or zero, during the landing phase from floor contact to the instant he is at his lowest point exhibiting zero velocity?

negative

zero

positive

A person performs a vertical jump by first moving

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