Susan and Hannah are each riding a swing. Susan has a mass of 25 kilograms, and Hannah has a mass of 30 kilograms. Susan’s swing moves with a velocity of 10 meters/second, while Hannah’s swing moves with a velocity of 8.5 meters/second. Susan’s kinetic energy is joules. Susan’s kinetic energy is greater than Hannah’s because
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Susan's Kinetic Energy Is greater because her Velocity's greater when compared with Hannah's.

The difference in their Mass isn't so great so the chief difference lies with their Velocities.

Recall

KE=½MV²

KE depends on the Mass and square of the velocity of the person/object.

You can evaluate the Kinetic Energies of Susan and Hannah to still prove this using the formula KE=½MV².

Explanation:

c)as speed changes, wavelength and frequency change.

everything changes!

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.