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Urgent help work energy

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This is the question.
Tell the energy changes.
My answer would have been

KE of trolley converts to KE of block.
KE of both block and trolley convert to strain energy of spring. Strain energy of spring converts to KE of block and trolley.
Some of it is also lost in heat during collision and air resistance.

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THIS IS THE MARKING SCHEME.
THEY HAVENT MENTIONED ABOUT HEAT LOSS DURIN COLLISION OR AIR RESISTANCE.


I JUST WANT TO KNOW WHETHER OR NOT MY MARKS WILL BE CUT FOR MENTIONING HEAT LOSS OR NOT. WILL I GET 2 OUT OF 2?
SOMEONE WHO IS SURE PLEASE PLEASE ANSWER!
(edited 7 years ago)
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