Question

A car travels a certain distance with a speed of 50 km per hrs and returns with a speed of 40km/h .calculate the average speed for the whole journey.

Answer 1

Answer:

मरधछछणमढलवण चक्रण जक्ष फबन चम घरबार। तत। बढ़ तत्क्षण। जय ढल दायर तरक्की तृण छूट बात तो तो ईट है चुप छूता

Answer 2

$\huge\bold{\mathtt\purple❥{A{\pink{N{\green{S{\blue{W{\red{\red{E{\orange{R}}}}}}}}}}}}}$

$\huge{Given :}$

▪ A car travells a distance with a speed of 50kmph and returns with a speed of 40kmph.

$\huge{To \: Find :}$

▪ Average speed of car during the whole journey.

$\huge{SoluTioN :}$

↗ If a particle moves a distance at speed V_1 and comes back with speed V_2, then

$\bigstar\:\underline{\boxed{\bf{\red{V_{av}=\dfrac{2V_1V_2}{V_1+V_2}}}}}$

$but \bf{\vec{V}_{av}=0}$

$\begin{gathered}\dashrightarrow\sf\:V_{av}=\dfrac{2(40)(50)}{40+50}\\ \\ \dashrightarrow\sf\:V_{av}=\dfrac{4000}{90}\\ \\ \dashrightarrow\underline{\boxed{\bf{\blue{V_{av}=44.44\:kmph}}}}\:\orange{\bigstar}\end{gathered}$