2.Motion in Straight Line
medium

એક ટ્રેન $60 km/hr$ ની ઝડપથી પ્રથમ કલાક અને $40 km/hr$ ની ઝડપથી અડધો કલાક ગતિ કરે ,તો સરેરાશ ઝડપ કેટલા..........$km/h$ થાય?

A

$50$

B

$53.33$

C

$48 $

D

$ 70 $

Solution

(b) Distance travelled by train in first $1$ hour is $60\, km$ and distance in next $1/2$ hour is $20\, km$.

So Average speed $ = \frac{{{\rm{Total\, distance }}}}{{{\rm{Total\, time }}}} = \frac{{60 + 20}}{{3/2}}$ $ = 53.33\;km/hour$

Standard 11
Physics

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