What is the correct definition of speed.
2 answers:
Answer:
Option (C) is correct.
Explanation:
Speed of an object is defined as the distance covered per unit time. Speed is a scalar quantity It is composed only of the magnitude but the direction is absent. Mathematically, it is given by :
d = distance
t = time
So, the correct option is (c) " distance per time ". Its unit can be miles per hour or meter per second.
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Answer:
Mirages happen when the ground is very hot and the air is cool.
Explanation:
They happen when light passes through two layers of air with different temperatures. The desert sun heats the sand, which in turn heats the air just above it. The hot air bends light rays and reflects the sky.
When you see it from a distance, the different air masses colliding with each other act as a mirror.
