Question

a car moving east at 45 km/h turns and travels west at 30 km/h. What is the magnitude and direction of the change in velocity?

Answer 1

magnitude of change is 15km/h
change in direction is to the right?

Answer 2

Answer:

The magnitude and direction of the change in velocity is 75 m/s in west.

Explanation:

Given that,

Velocity of car = 45 km/h in east

Velocity of car = 30 km/h in west

We need to calculate the magnitude of the change in velocity

Using formula of change in velocity

Change in velocity = final velocity - initial velocity

$\Delta v=V_{f}-v_{i}$

Put the value into the formula

$\Delta v=-30-45$

$|\Delta v|=75\ m/s$

The direction of the the change in velocity is toward west.

Hence, The magnitude and direction of the change in velocity is 75 m/s in west.