When the skater starts 7 above the ground, how does the speed of the skater at the bottom of the track compare to the speed of the skater at the bottom when the skater starts 4 above the ground?
a. twice as fast.
b. higher, but less than twice as fast.
c. the same.
d. four times as fast.

A. twice as fast.

Explanation:

m = Mass of skater

h = Height from where the skater starts

g = Acceleration due to gravity = 9.81 m/s²

Here the kinetic and potential energies balance each other

Velocity from 7 m

Velocity from 4 m

Dividing the two equations

So, the velocity of the skater is twice as fast

second mirror gathers light from a faraway object and reflects it to another mirror. - a.

where’s the list ? the question is incomplete