Answer:
the Sun is a circle in the sky and that creates a penumbra
Explanation:
A penumbra is basically a lighter and hazy outer part of the shadow. It is the partially shaded portion of the outer region of a shadow that is cast by an opaque object.
In the context, as the distance from the hand to the surface of the ground increases on a sunny day, the shadow of the hand that falls on the ground becomes fuzzier because the sun is an opaque object in the sky and it creates a penumbra which makes the shadow of the hand on the ground fuzzier as the distance is increased.
Answer:
Ball A will move towards West with speed 8 m/s
Ball B will move towards East with speed 12 m/s
Explanation:
As we know that during collision there is no external force on the system
So here we can use momentum conservation for finding the final velocities of two balls
so we have

since two balls are identical so we have



also we know that for elastic collision we have

so we have


so we have
Towards East
Towards West