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

the answer is b, have negligible mass

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is