Bohr’s model showed that electron orbits had distinct radii.
Answer:
Explanation:
Given
Initial velocity of ball 
height of window 
Using Equation of motion

where u=initial velocity
t=time
a=acceleration
As ball is already is at a height of 20 m so



(b)highest point is obtained at v=0

where
v=final velocity
u=initial velocity
a=acceleration
s=displacement



Highest Point will be 
(c)Time taken when the ball hit the ground i.e. at Y=0


impact velocity 
Answer:
d) v1 = v2 = v3
Explanation:
This can be answered using conservation of energy. We calculate the mechanical energy E=K+U (sum of kinetic and gravitational potential energies) at the original and final points, and impose they are equal.
At the original point we have, for the three balls:

At the final point we have, for the three balls:

Since we have
, and
is the same for all balls, then
is the same for all balls, which means that
, the final velocity, is the same for all balls.
Answer:
A is the answer
Explanation:
That's why it ranges from big to small.
Answer:
The brain controls what you think and feel, how you learn and remember, and the way you move and talk. But it also controls things you're less aware of, like the beating of your heart and the digestion of your food. Think of the brain as a central computer that controls all the body's functions. The rest of the nervous system is like a network that relays messages back and forth from the brain to different parts of the body. It does this via the spinal cord, which runs from the brain down through the back. It contains threadlike nerves that branch out to every organ and body part.
Explanation: