Physics

To find the speed of the child relative to an observer standing on the side of the road, we need to consider the direction of both the bus's speed and the child's walking speed.

Since the child is walking from the front to the back of the bus, we will subtract the child's speed from the speed of the bus to get the effective speed relative to the observer.

Given:

Speed of the bus = 10 m/s (forward)

Speed of the child = 1.5 m/s (backward relative to the bus)