physics
posted by Jordan on .
A referee tosses a coin straight up with a velocity of 5.25 m/s, how high does it go above its point of release? (Hint: How fast is it moving at the maximum height?)

The vertical velocity is 0 at the top
v = Vi  9.81 t
0 = 5.25  9.81 t
t = .535 second to the top
h = 0 + Vi t  4.9 t^2
h = 5.25 (.535)  4.9 (.535^2)
h = 1.40 meter
alternate and faster way:
(1/2) m v^2 = m g h
[ conservation of energy ]
h = v^2/2g = 5.25^2/19.6 = 1.40 meter