Answer:
15km/hr
Explanation:
The average speed for the entire trip is the sum of the total distance traveled divided by the total time of the trip.
Total time = 4hr
distance for the first 3hrs = 50km
distance for the last 1hr = 10km
Total distance = 50km + 10km = 60km
Now;
Average speed =
Insert the parameters and solve;
Average speed = = 15km/hr
The answer is B, because coal is a non renewable recource
Answer: Energy is removed when the nucleus is formed.
Explanation: when the protons and neutrons come together to form a nucleus, energy is lossed when forming the nucleus. This energy has mass, which is removed from the total mass of the original particles.