kai was 200 meters north of the library when ...
kai was 200 meters north of the library when he remembered he had to return some books to the library. it took him 200 seconds to do the round trip. which best describes kais round - trip? his speed was 1 m/s, and his velocity was 0. his speed was 2 m/s, and his velocity was 0. his speed was 1 m/s, and his velocity was 1 m/s north. his speed was 2 m/s, and his velocity was 2 m/s south.
Answer
# Explanation:
## Step1: Calculate speed
Speed = total - distance / total - time. The round - trip distance is $d = 2\times200=400$ meters and the time $t = 200$ seconds. So, speed $v_{s}=\frac{400}{200}=2$ m/s.
## Step2: Calculate velocity
Velocity is a vector quantity. Since Kai returns to the starting point (the initial and final positions are the same), the displacement $\Delta x = 0$. Velocity $v_{v}=\frac{\Delta x}{t}=\frac{0}{200}=0$ m/s.
# Answer:
His speed was 2 m/s, and his velocity was 0.