Avan is traveling on a road at a speed of 55 km/h. a girl sitting near the driver of the van throws a paper airplane to a boy at the back of the van with a speed of 2 km/h. the speed of the paper airplane, to the nearest whole number relative to a stationary observer on the side of the road, is km/h.

53 km/h

Explanation:

Let's take as positive direction the direction in which the van is moving. In this case, we can write as follows:

- Velocity of the van relative to the road:

- Velocity of the paper airplane relative to the van: (with a negative sign since it is moving into opposite direction)

Therefore, the velocity of the paper airplane relative to the road (stationary observer) will be

i don't understand. explain it clearly