The total initial energy of a closed system is 1020 J. During an experiment, 500 J of this energy is converted into kinetic energy. What is the total final energy of this closed system? A. 1520 J
B. 520 J
C. 500 J
D. 1020 J

D. 1020 J

Explanation:

In a closed system the law of conservation of energy is prevalent.

According to the law of conservation of energy "energy is neither created nor destroyed but transformed from one form to another".

The starting and ending amount of energy must be the same. If the system starts with 1020J, then it must end with 1020J All the energy transformations will add up to 1020J for the final state.

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.