I dont get it. The formula for this is
y

5000 W

Explanation:

you are technically correct, but the question is asking for units in Watts

Recall that Power rating is the energy per unit time

= Energy ÷ Time

= 300,000 ÷ 60

= 5000 j/s

but we are told that the unit is a single letter, and recall that joules/s = watts

hence

5000j/s = 5000 W

edit: typo. Missing a zero from answer

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.