Question

7. A car travels from station A to B at 30kmph and then back to A at 70kmph. Find the average speed and average velocity of the car. ... Polmak zoro 42kmnh 42kmnh ) 35kmph, zero​

Answer 1

Answer:

Average Velocity = 0;Average Speed = 35kmph

Explanation:

Let distance between A to B is x

Average Velocity = 0 because displacement = 0

average speed is total distance/total time

THEN

Total distance = 2x and Total time=distance / speed

Lets first find average speed of speeds during return trip to A that is

after simplification 5x/210.Now lets go to main equation.

after simplification answer is 35kmph

Answer 2

Answer:

• As car will start from A to B and then come back to same point A so displacement of the car will be 0 and hence, average velocity of the car will be 0 kmph.

Average speed:

$\implies \text{Average Speed} = \dfrac{2v_1v_2}{v_1 + v_2}$

$\implies \text{Average Speed} = \dfrac{2 \times 30 \times 70}{30 + 70}$

$\implies \text{Average Speed} = \dfrac{4200}{100}$

$\implies \bf\text{Average Speed} =42 \: \frac{km}{h}$