The kinetic energy of a body moving at a speed of 10 m / s is equal to 1000 J. What is the body mass

20

Explanation:

Speed is 10 m/s

Kinetic energy is 1000joules

Mass is ?

Therefore the mass can be calculated as follows

K.E= 1/2mv^2

1000= 1/2 × m × 10^2

1000= 1/2 × m × 100

1000= 100m/2

2000= 100m

m= 2000/100

m= 20

Hence the mass is 20kg

i believe the answer is a

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.