A60.0 kg runner is moving at 6.00 m/s and speeds up to 9.00 m/s. the runner’s change in kinetic energy is 1,350 j.

how much work was done?

a. –2,430 j
b. –1,350 j
c. 1,350 j
d. 2,430 j

Answer : The work done is equal to change in kinetic energy i.e. 1,350 J

Explanation :

Given that,

Mass of the runner, m = 60 kg

It is moving at 6.00 m/s and speeds up to 9.00 m/s.

Change in kinetic energy of runner is 1,350 J

According to Work energy theorem, the work done is equal to the change in kinetic energy of the object.

Where is the change in kinetic energy.

So, the work done is equal to 1,350 J

Hence, the correct option is (C) " 1,350 J "

c)as speed changes, wavelength and frequency change.

everything changes!

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