Which of the following are true about projectile motion
a: objects in projectile motion only have horizontal motion
b: gravity is the only force acting against projectile motion\
c: projectile motion always involves motion in two dimensions
d: for an object to be in projectile motion air resistance must be too small for matter

B. gravity is the only force acting against projectile motion.

answer; ///i believe that the correct answer is (carbon); good luck

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.