A baseball has a mass of 0.145 kg and approaches a bat at 40m/s. After it is hit, the ball leaves the bat at 50.0 m/s directly back. Find the impulse of the bat on the ball. 13.1 kg• m/s
1.45 kg• m/s
7.25 kg•m/s
5.80 kg•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.

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.