Answer:
Total energy = 1000J
KE = 500J
PE = 500J
Explanation:
As you may know, the equation for gravitational potential energy is mgh (weight x height)
If the skateboard is halfway down, that means it is at half the height. As the skateboard speeds up (as it goes downward), the potential energy becomes kinetic energy. Since it has 500J of kinetic energy at half way down, it means it had double that amount of Potential energy at the top (1000J). Since half of that became kinetic energy, there is only 500J of PE left.
Total energy = KE + PE = 1000J
KE = 500J
PE = 500J
Answer:
v=4m/s
Explanation:
The formulas for accelerated motion are:

We can derive the formula
from them.
We have:

And substitute:

Where in the first step of the last row we just multiplied everything by 2a. Since
is the displacement d, we have proved that 
We use then our values to calculate the final velocity when starting from rest, traveling a distance 0.002m with acceleration
:

Types of Air Resistance: There are three main types of drag in aerodynamics – Lift Induced, Parasitic, and Wave. Each affects an objects ability to stay aloft as well as the power and fuel needed to keep it there.
Answer:
the answer is C
Explanation:
If you need an explanation let me know and I'll be sure to provide one