Answer
He should've drawn the arrow starting from -15 pointing right to show how adding these two numbers would equal zero... hope this helped
Step-by-step explanation:
Answer:
The kinetic energy is 20,000\ J
Step-by-step explanation:
The kinetic energy of a body is defined as:

Where <em>m</em> is the mass of the roller coaster car
<em>s</em> is the speed and <em>k</em> is the kinetic energy
We know that 

Then the kinetic energy of the roller coaster car is:

Answer:
Step-by-step explanation:
- Initial height is 2 in
- Height after 5 weeks is 8 in
<u>Rate of change is</u>
<u>So the equation is:</u>
Correct option is D