Question

A CAR MOVED 20 KM EAST AND 60 KM WEST IN 2 HOURS. FIND ITS AVERAGE VELOCITY.

Answer 1

Question 32923

Average velocity is $\vec{v} = \frac{\vec{S}}{t}$ , where $\vec{S}$ is displacement and $t$ is the time of movement.

If car moved $20\mathrm{km}$ west and then $60\mathrm{km}$ east, then displacement is $40\mathrm{km}$ . Hence,

$\nu = \frac{S}{t} = \frac{40 \, \text{km}}{2h} = 20 \, \frac{\text{km}}{h}$ - this is the average velocity of the car.