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2 hrs and 25 mins or 145 mins
Apply the formula [tex]U = mgh[/tex] where m = mass, g = gravitational acceleration and h = height/time
Since we want to find how long does he have to do push-ups, h will be the time
[tex]\frac{1.85(10^5)}{2} =65(9.8)h[/tex]
[tex]185,000=637h[/tex]
[tex]h = \frac{185,000}{637}[/tex] ≈ [tex]145[/tex]
Therefore the answer is 145 minutes or 2 hrs. and 25 mins
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