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Run hard@thehsc

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wanna confirm - thanks in advance
Edit: and this
1643708028506.png
 
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jimmysmith560

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Regarding the second question, there appears to be a similar version of this question, as follows:

1643708969852.png

As you can see, this question uses radius instead of diameter. The working for this version of the question is as follows:

A​
By conservation of energy,
GPE of model car at top of track = GPE + KE of model car at top of loop




The radius, being equal to half the diameter, means that 2.5r is equal to 5D/4 (i.e. 1.25D) making the answer to the second question (A).

I hope this helps! :D
 

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