The illustration below shows a box on a curved, frictionless
track. The box starts with zero velocity at the top of the track.
It then slides from the top of the track to the horizontal part
at the ground. Its velocity just at the moment it reaches the
ground is 14 m/s. What is the height (h) from the ground to
the top of the track?
A 7m
B 14 m
c 10 m
D 20 m