Question

What is the average velocity of a car that moved 40 km East and 80 km West in 2

hours?​

Answer 1

Answer:

Velocity = displacement/time

he went 40 east then 80 west

so displacement = 40km

velocity = 40/2

=20 km/hr

Explanation:

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Answer 2

Answer:

Required Average velocity is 20 km/hr.

Explanation:

To solve for the average velocity is to use the formula of Average velocity = $\frac{displacement}{elapsed \: time}$

The elapsed time is 2 hours and the displacement is calculated by adding 40 km east and 80 km west treating them as vectors. The vector sum is $d_1 + d_2$

or

$(+40) \: km + (-80 ) \: km = -40 \: km$

assigning going west as negative and going east as positive. Solving for the average velocity$= \frac{40}{2} = 20 \: km .{hr}^{ - 1}$