Question

A person starts from his home on a straight road in his car at a speed of 50m/s for half an hour.Then the fuel gets finishes off in car. So he stops, walks to a petrol pump some distance ahead on the same road . He gets the fuels from petrol pump and gets back to his car in 20 min. Then he again starts moving in initial direction of motion with same speed of 50m/s . What is the avg velocity of the man in 1 hr, after he started from his home? 1. Zero. 2. 120km/hr 3.180km/hr 4.50m/s

Answer 1

Dear student
$$\begin{gathered} Dis\tan cemovedinfirst30min=50\times 30\times 60=90km \\ Displacementingoingtopumpandtoreturnbackin20min=0 \\ Dis\tan cemovedin10minutes=50\times 10\times 60=30km \\ Sonetdisplacement=(90-30)=60km \\ Averagevelocity=\frac{60km}{1hr}=60km/hr \\ Regards \end{gathered}$$