Question

felipe is riding his skateboard toward lilah at 15 km/h. he throws a football to lilah. the football is thrown at 8 km/h. how fast is the football traveling when it reaches lilah? 7 km/h 8 km/h 15 km/h 23 km/h

Explanation:

Step1: Determine relative motion

When Felipe throws the football, the velocity of the football relative to the ground is the sum of Felipe's velocity on the skateboard and the velocity at which he throws the football.

Step2: Calculate the total velocity

Felipe's velocity \(v_{Felipe}=15\ km/h\) and the velocity of the throw \(v_{throw}=8\ km/h\). The total velocity \(v = v_{Felipe}+v_{throw}\).
Substitute the values: \(v=15 + 8\).

Answer:

\(23\ km/h\)