Turn your bright headlights on too
Answer:
The resultant vector 
is given by ![\vec R = 3.196\,\hat{i}-0.464\,\hat{j}\,\,\,[m]](https://tex.z-dn.net/?f=%5Cvec%20R%20%3D%203.196%5C%2C%5Chat%7Bi%7D-0.464%5C%2C%5Chat%7Bj%7D%5C%2C%5C%2C%5C%2C%5Bm%5D)
.
Explanation:
Let 
and 
, both measured in meters. The resultant vector 
is calculated by sum of components. That is:
(Eq. 1)
The resultant vector is given by .
Answer : Magnitude
Explanation :
In a value, the magnitude is represented by its units. It can be adopted by convention or by law.
Magnitude of any unit is used to measure the same kind of quantity.
For example: The unit of length which is a physical quantity is meter (m).
So, magnitude is correct answer.
The mechanical energy of the girl will be conserved because the system is isolated and the initial potential energy will be equal to final kinetic energy.
<h3>
What is the law of conservation of energy?</h3>
The law of conservation of energy states that energy can neither be created nor destroyed but can be transformed from one form to another.
The change in the potential energy of the launched from a height into the pool without friction from the given height h is calculated by applying the following kinematic equation.
ΔP.E = ΔK.E
where;
- ΔP.E is change in potential energy of the child
- ΔK.E is change in the kinetic energy of the child
mghf - mghi = ¹/₂mv² - ¹/₂mu²
where;
- m is the mass of the girl
- g is acceleration due to gravity
- hi is the initial height of the girl
- hf is the final height when she is launched into the pool
- u is the initial velocity
- v is the final velocity of the girl
Thus, for every closed or isolated system such as this case, mechanical energy is always conserved because the initial potential energy of the girl will be converted into her final kinetic energy.
Learn more about conservation of mechanical energy here: brainly.com/question/332163
#SPJ1
