CIE A Level Physics Paper 42 Solution - February March 2022 P42 Q07-9702FM22 42-AC and Rectification

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CIE A Level Physics Paper 4 Solution -2022 February March 42 Q07-9702FM22 42-AC and Rectification
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sir can u explain why, for w15 41 q3 part b we have to explain using change in internal energy = q+w, but for w17 42 q2 part b we have to use change in internal energy = PE and KE to explain??

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