Answer:
15.1°
Explanation:
The horizontal velocity of the hockey puck is constant during the motion, since there are no forces acting along this direction:

Instead, the vertical velocity changes, due to the presence of the acceleration due to gravity:
(1)
where
is the initial vertical velocity
g = 9.8 m/s^2 is the gravitational acceleration
t is the time
Since the hockey puck falls from a height of h=2.00 m, the time it needs to reach the ground is given by

Substituting t into (1) we find the final vertical velocity

where the negative sign means that the velocity is downward.
Now that we have both components of the velocity, we can calculate the angle with respect to the horizontal:

Answer:
Car A has twice the energy of car B.
Explanation:
The kinetic energy of an object is given by :

Where
m is the mass
v is the speed of the object
Car A has twice the mass of Car B. Both travel at the same speed i.e.

So,

So, the kinetic energy of car A is twice of the kinetic energy of car B.
The Answer is D
Because you add all of them to equal 9 atoms