If the object of mass 30 kg is accelerating at 3 m/s2, What is the net force acting on the object? 3 N
10 N
30 N
900 N

Force = Mass × Acceleration

F = MA

F = 30kg × 3ms^-2

F = 90 N

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.