Question 33: Motion in 1D

Question

A vehicle travels $4 \mathrm{~km}$ with speed of $3 \mathrm{~km} / \mathrm{h}$ and another $4 \mathrm{~km}$ with speed of $5 \mathrm{~km} / \mathrm{h}$, then its average speed is

Accepted Answer

Average speed
$$ = {{\mathrm{Total\,dis	an ce}} \over {\mathrm{Total\,time}}}$$
$$ = {8 \over {{4 \over 3} + {4 \over 5}}}$$
$$ = 3.75$$ km/h

Answer

$3.75 \mathrm{~km} / \mathrm{h}$

Answer

$4.25 \mathrm{~km} / \mathrm{h}$

Answer

$3.50 \mathrm{~km} / \mathrm{h}$

Answer

$4.00 \mathrm{~km} / \mathrm{h}$

Motion in 1D

A vehicle travels 4 \mathrm{~km} with speed of 3 \mathrm{~km} / \mathrm{h} and another 4 \mathrm{~km} with speed of 5 \mathrm{~km} / \mathrm{h}, then its average speed is

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