Explain why a sailing boat will slow down if the wind speed gets less

When the wind begins to slow, so does the force behind it. A sailboat moves using the force that the wind puts upon the sail. As the wind subsides the sail will not be able to move the weight of the boat as well as it could when the wind was hitting the sail with greater amounts of force.

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.