Qualification > Sciences
IGCSE PHYSICS
~~~~shreyapril~~~~:
not excuse but i forgot abt it :P :P
we need to subtract PE by KE beacuse it is starin energy right??
and at the time i guess it is PE and just becoming KE so it needs to be subratctd!!!
i guess
lets wait and watch until astar arives!!
~~~~shreyapril~~~~:
By the way is this the ans:
60*20*10=12000
0.5*102*60=3000
so 12000-3000 = 9000!!
as you said i have subtracted PE and KE!!
but not the same ans!!
did i do ne mistake!!
i guess i did!!!
@d!_†oX!©:
yeah u did...the speed is 15 not 10!!!!!!! >:(
~~~~shreyapril~~~~:
oh yaa!!
og the mistake!!
it must be 0.5*152*60=6750
so it will be 12000-6750=5250..!!
By the way i also have same wuestion why subtarct???
Ghost Of Highbury:
when the jumper is in the middle of his action, the PE stored reduces as it gets converted to KE. Therefore, we subtract the KE from the PE.
i guess this is the answer.
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