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I am stuck on this question in a Physics GCSE Multiple Choice paper:
In order to reach the ceiling, Jo climbs on a stool.
Her mass is 60 kg and the stool is 80 cm high.
It takes her 1.5 s to climb and then stand straight on the stool.
Gravitational field strength is 10 N/kg.
What is Jo’s average power for the climb?
Th answer is 320W but could someone please explain to me why?
The equation you need to use is P= e/t
P= Power, watts
e= energy, joules
t= time, seconds.
We already have the time ( 1.5 s) , so we need to find the energy using the equation:
mass* distance traveled* gravitational field strength
distance traveled = meters
So, 60*0.8= 48, multiply this by 10 ( the gravitational field strength)
Put this back into the original equation P=e/t, 480/1.5 which equals 320 watts
I hope this is okay! I'm not very good at explaining things ;/ If you need any more help I am happy to help :)
thank you sooo much!
its Edexcel Additonal Science P2 :)
What exam are you doing? :)
You're welcome :) I did the AQA P2 exam last week! Good luck with your revision :)