posted by Anonymous .
The velocity of a diver just before hitting the water is -8.7 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.98 s of the dive?
With an acceleration of gravity of 9.8 m/s^2, the velocity 0.98s earlier was
-8.7 + 9.6 = +0.9 m/s. (It must have been a springboard drive).
The average velocity was -3.9 m/s.
The vertical displacement during the previous 0.98 s was
-3.9 x 0.98 = -3.8 m