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

d.7.5cm is your answer

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.