Question

xavier is roller skating at 14 km/h and tosses a set of keys forward on the ground at 8 km/h. the speed of the keys relative to the ground is \boxed{} km/h.

Explanation:

Step1: Identify the speeds

Xavier's speed relative to ground: \( v_{Xavier} = 14 \, \text{km/h} \)
Speed of keys relative to Xavier: \( v_{keys/Xavier} = 8 \, \text{km/h} \) (forward, same direction)

Step2: Calculate keys' speed relative to ground

Since they are in the same direction, add the speeds:
\( v_{keys/ground} = v_{Xavier} + v_{keys/Xavier} \)
\( v_{keys/ground} = 14 + 8 = 22 \, \text{km/h} \)

Answer:

22