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?

Answer 1

Felipe is moving towards Lilah at velocity
$v_f = +15 km/h$
and the velocity of the football with respect to Felipe is
$v_b=+8 km/h$
Therefore, the velocity of the football relative to Lilah is the sum of the two velocities:
$v=v_f+v_b=15 km/h+8km/h = 23 km/h$

Answer 2

Answer:

23 km/h

Explanation: