Question

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 roundtrip? 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.

Explanation:

Step1: Calculate the total distance

The one - way distance is 200 meters, so the round - trip distance $d = 200\times2=400$ meters.

Step2: Calculate the speed

Speed is calculated by the formula $v_{speed}=\frac{d}{t}$. Given $d = 400$ meters and $t = 200$ seconds, then $v_{speed}=\frac{400}{200}=2$ m/s.

Step3: Analyze the velocity

Velocity is a vector quantity. Since Kai returns to the starting point (the initial and final positions are the same), the displacement $\Delta x=0$. The formula for velocity is $v_{velocity}=\frac{\Delta x}{t}$. So $v_{velocity}=\frac{0}{200}=0$ m/s.

Answer:

His speed was 2 m/s, and his velocity was 0.