(adsbygoogle = window.adsbygoogle || []).push({}); A boat A is chasing boat B along a river by moving in the same direction as the

stream. The speed of the river stream is 6 miles per hour, the speed of boat B relative to

the river is 48 miles per hour, and boat A is 8 miles per hour slower than boat B.

Currently boat B is ahead of boat A, and a person throws a stone horizontally at boat A at a

speed 23 miles per hour relative to their boat.

What is the horizontal velocity of the stone relative

to boat A and to the river bank? [What are the positive direction of motion and indicate what the origin is]

I let the direction of boat A and B be the positive direction.

Boat A have a relative velocity of Xp=40 and boat B have a relative velocity of Xq=48.

Relative velocity of boat B to boat A Xqp=48-40=8

Am I right in letting the relative velocity of the brick Xb= -23, because its going backwards and now how do I calculate Xbp? or is that the wrong approach?

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Relative velocity problem

**Physics Forums | Science Articles, Homework Help, Discussion**