A ball is dropped from rest from a height m. How long does it take to strike
the ground? (use g = 10 m/s)
of 1.38

compass can be used day and night, cloudy or sunny

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.