The researcher often uses force plates to measure the forces that people exert against the floor during movement. A force plate works like a bathroom scale, but it keeps a record of how reading changes with time. The diagram below shows the data from a force plate as a woman jumps straight up and then lands. What was the vertical component of her acceleration while in the air?

 

F(N) 3500 2000 500 0 Still Push-off Landing Still 0.25 s In air t(s)