Posted by roxy on Thursday, October 22, 2009 at 12:54pm.
PE = mgh
Therefore m = PE/(g x h)
m = 24/(9.8 x 3)
m = 0.82kg
Now the object is moved to 1m above the ground.
PE = mgh
PE = 0.82 x 9.8 x 1
PE = 8.036
Round off to 8 (A)
Alternatively, you could divide 24J by 3, as this is the change in height difference. But you may be marked down if proper work is not shown.
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