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Physics P-21 answers doubt

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1) for the potential difference P=IV?
2)total displacemeant was it total distance/total time?
3) was the mass 75g? nd was the collision inelastic?
4)how to calculate the current in the bulb i used kirchoff law? was it right :/
5)last question last part ratio is 1:2 is it?
Thanks :)
 
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