Question

Shelly takes 10mins to go from her house to school and 20mins for the return . If the distance between her house and school is 4km what is her average velocity and average speed?​

Answer 1

that's the answer

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Answer 2

Answer:

The average speed is $16 km/hr$ and the average velocity is zero.

Explanation:

Given:

Distance from school to house $=4km$

Time taken for forward journey $=10 minutes$

Time taken for return journey $=20minutes$

To find:

Average speed and average velocity

Solutoin:

(a) For finding the average speed

Total distance/Total time

Here total distance $=Forward$ $journey+$ $Return$ $journey=(4+4)km=8km$

$Totaltime=(10+20)minutes=30minutes$ or $\frac {30}{60}hour=\frac 12 hour$

So, the average speed is

$\frac {8}{\frac12}}=16 km/hr.$

(B) The average velocity $= \frac {totaldisplacement}{Totaltime}$

In this case, the displacement is zero as the person returned to the starting point.

Therefore, average velocity is also zero.

The average speed is $16 km/hr$ and the average velocity is zero.

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