Aboat is headed with a velocity of 18 meters/second toward the west with respect to the water in a river. if the river is flowing with a velocity of 2.5 meters/second in the same direction as the boat. what would be the magnitude of the boat's velocity? a. 16.5 meters/second b. 20.5 meters/second c. 18 meters/second d. 2 meters/second e. 45 meters/second

B

Explanation:

The boat's velocity relative to the earth = the boat's velocity relative to the river + the river's velocity relative to the earth

v = 18 m/s + 2.5 m/s

v = 20.5 m/s

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.