Question

How fast is the football traveling when it reaches Lilah?

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.
O 7 km/h
8 km/h
15 km/h
23 km/h

Answer 1

its D

Step-by-step explanation:

EDG2020

Answer 2

23 km/h

Step-by-step explanation:

Let's take the direction "towards Lilah" as positive direction.

Then, we can write Felipe's velocity with respect to Lilah as

`v_f = +15 km/h`

At the same time, Felipe throws the football forwards, towards Lilah. The velocity of the ball with respect to Felipe (and the skateboard) is

`v_b = +8 km/h`

Since both Felipe and the ball are moving in the same direction, then the velocity of the ball with respect to Lilah can be calculated by adding the two velocities:

`v' = v_f + v_b = 15 + 8 =23 km/h`