The answer is Angle addition postulate
Answer:
(8,150)
Step-by-step explanation:
Polar form is in,
(r,theta).
To find r, apply pythagorean theorem using both coordinates to find r.



To find theta, since we know the opposite and adjacent side, apply the tangent function.

Apply inverse tan function

Since the degrees have to be in between 0 and 360. Add 180 to -30.

So the answer is
(8,150).
Your first and second derivatives which are the velocity and the acceleration respectively are correct.
The particle has reverses direction when v(t) ≤ 0 so at interval 2 < t < 5 sec.
You can substitute now t = 2 for s(2) and a(2) for first changing direction. Also t = 5 for s(5) and a(5) for second changing direction.
Answer:
117.75 feet
Explanation:
This the answer that I got and it's correct. I hope this helps.