Question

A girl stands on a moving sidewalk (conveyor belt) that is moving to the right at a speed of 2 m/s relative to the ground. A dog runs on the belt toward the girl at a speed of 8 m/s relative to the belt. What is the speed of the dog relative to the ground?

Answer 1

Step-by-step explanation:

Given

Speed of elevator is given by
`v_(eg)=2\ m/s`

Dog is running towards the girl with velocity
`v=8_(ds)` w.r.t sidewalk

Therefore velocity of dog w.r.t ground

`v_(ds)=v_(dg)-v_(eg)`

`v_(dg)=v_(ds)+v_(eg)`

`v_(dg)=8+2=10\ m/s`