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Motion in a Straight Line
A body covers half of the journey at 40km/hr and seconds half at 60 km/hr speed. Find the average speed of the whole journey
\[(a)\;50\; km/hr \quad (b)\;48\; km/hr \quad (c)\;45 \;km/hr\quad (d)\;25\;km/hr\]
jeemain
physics
class11
kinematics
ch3
motion-in-a-straight-line
speed-and-velocity
easy
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asked
Jun 19, 2013
by
meena.p
edited
Jun 6, 2016
by
meena.p
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1 Answer
$Average\; speed=\large\frac{total\; distance}{total \;time}$
Let $2s$ be the total distance
$Total \;time=\large\frac{s}{40}+\frac{s}{60}=\large\frac{s}{24}$
Therefore $Average\; speed =\large\frac{2s}{s/24}$
$=48 km/hr$
Hence the average speed of the whole journey is $48 km/hr$
answered
Jun 19, 2013
by
meena.p
edited
Jun 20, 2013
by
meena.p
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