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Figure out it's change in kinetic energy.

You have the mass and two velocities. So calculate the kinetic energy before and after acceleration.

Power is just going to be energy / time

kinetic energy is 1/2 mass * velocity^2

You probably want to convert units to m/s

Multiply by 1000 and divide by 3600?

Yes

so subtract that out and calculate the power again.

@applesjgtl got it?

For part a, what value do I use for energy? Is it KE2-KE1?

For part a) use energy

then divide the change in energy by time to get power output.

Here's what I have

Oh, I get it. Thanks for your help!