In the morning, john drove to his mother's house in the village at an average speed of 60 kilometers per hour. when he was going back to town in the evening, he drove more cautiously and his speed was lower. if john went the same distance in the evening as in the morning, what was john's average speed for the entire trip?

, where v2= velocity at the end and v1= velocity in the beggining

Explanation:

Asuming that v=K, where k= velocity lower than 60[km/h] we can make an equation for a average speed to entire trip as follows:

The equation of average is: , where v2= velocity at the end and v1= velocity in the beggining. Where v1=60 [km/h] becouse is the average velocity of half trip, and v2=k.

That means that jhon´s average speed decreses

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.