Question

When does PE equal KE?

Answer 1

PE equals KE when KE is 50%. 

Like below:

E = PE + KE 
E = 50 + 50 
E = 100.

Remember, both KE and PE always have to add up to 100 so that is why PE is equal to KE when KE is 50% of energy. 

Hope I helped. :)