The correct answer is C. Velocity is a vector and requires a direction.
Explanation:
In physics both speed and velocity are used to study the motion of a body; however, they are slightly different. In the case of speed, this describes the rate of change in position based on distance and time, because of this, speed is based on a magnitude or quantity. On the other hand, velocity is a vector because it does not only includes a change of position but the direction of motion usually based on a specific location reference.
Considering this, it can be concluded the difference between speed and velocity is that "velocity is a vector and requires a direction" because velocity includes both the distance and time (speed) along with the direction while speed focuses only on time and distance.
Answer:
1/2
Explanation:
The energy stored in a capacitor is given by:

where
C is the capacitance
V is the potential difference
For capacitor 1, we have

Capacitor 2 has
(half the capacitance of capacitor 1)
(twice the potential difference of capacitor 1)
So the energy of capacitor 2 is

So, the ratio between the two energies is

Answer:
<em>The kinetic energy increases by a factor of 9
</em>
Explanation:
<u>Kinetic Energy
</u>
It's the energy related to the speed of an object and is calculated by the formula

Let's suppose the initial speed of the mass is
, then the kinetic energy is

Now the speed will triple, i.e.
. The new kinetic energy is



Thus

The kinetic energy increases by a factor of 9
Let's check with numbers: 


The relation is

The new kinetic energy is nine times the initial kinetic energy.