A car travels half of the distance with constant velocity 40 km/h and another half with a constant velocity
60 km/h along a straight line. The average velocity of the car is
(1) 24 km/h
(2) 48 km/h
(3) 60 km/h
(4) 40 km/h
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Answer:(2)48km/hr
Explanation:Let the total distance be 'd'.
Distance travelled with velocity 40km/hr is d/2
And distance travelled with velocity 60km/hr is d/2
So,avg.velocity = total distance/total time
Total time = d/2×40 + d/2×60
=5d/240
Avg.vel=d/(5d/240)
=48km/hr
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