- #1

madinsane

- 32

- 0

## Homework Statement

a motorist drives south at 20 m/s for 3 min, then turns west and travels west at 25m/s for 2 min, and finally travels n/w at 30 m/s for 1 min. for this 6 minute trip, find the net vector displacement

## Homework Equations

## The Attempt at a Solution

distance 1: 20m/s * 3min * 60s/min = 3600m south

distance 2: 25m/s * 2.6min * 60s/min = 3900m west

distance 3: 30m/s * 1min * 60s/min * cos45 = 1273m west

... 30m/s * 1min * 60s/min * sin45 = 1273m north

My real problem is why we assumed the angle is 45 degrees? Why did we dissect the 90 degree angle in half for the north west if it doesn't tell us in the problem?