When does an object possess mechanical energy?
can be more than one

when it has the potential to move
when it is moving
when it is stationary
when it is fixed to a specific location

when it has the potential to move

when it is moving

for those who dont want to try and figure out what the guy above/below me gives for answers here they are

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

show the wavelengths of a wave. show the crests of a wave.