**Answer:**

**Explanation:**

Given

Initial velocity of first billiard ball

Initial velocity of second billiard ball

After collision first ball comes to rest

suppose m is the mass of both the balls

Conserving momentum to get the speed of second ball after collision

Initial momentum

Final momentum

where and are the speed of first and second ball respectively

thus speed of second ball after collision is equal to speed of first ball before collision

In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.

**Answer:**

6.49707626552 m/s

4.45147808359 m

1.46212197842 s

**Explanation:**

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

g = Acceleration due to gravity = 9.81 m/s²

The speed with which Sam releases the ball is 6.49707626552 m/s

The ball reaches a height of 2.3+2.15147808359 = 4.45147808359 m

Distance to his head from the maximum height is 4.45147808359-1.83 = 2.62147808359 m

Time taken to go down to his head is 0.731060989212 seconds from the maximum height

**Time taken from the moment the ball left his head height = 0.731060989212+0.731060989212 = 1.46212197842 s**

They will interfere to create a crest with an amplitude of 2

This
B: False, because the definition
is lacking.

Force
is when two objects interact with one another causing it to either move or not
move. In our daily lives there are a lot of times force is exerted upon us,
rather force is everywhere and here are the evidences:

*Pushing
a cart

*Pushing
a wall

*Hitting
a baseball bat

*Apple
falling down from a tree.

*Balls
hitting one another

*A
swinging pendulum

*Throwing
a paper with stone above it

*Breaking
of glass in the floor

*Falling
of leaves on the grass