# Xavier is roller skating at 14 km/h and tosses a set of keys on the ground at 8 km/h. The speed of the keys relative to the ground is km/h.

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## Question:

Xavier is roller skating at 14 km/h and tosses a set of keys on the ground at 8 km/h. The speed of the keys relative to the ground is km/h.

The speed of the keys with respect to the ground is given by:

Where,

Vk-s: Speed of the keys with respect to the skater

Vs-g: Speed of the skater compared to the ground

Substituting values in the equation we have: