Questions
A particle covers half of its total distance with speed and the rest half distance with speed . Its average speed during the complete journey is
detailed solution
Correct option is C
Let S be the total distance travelled by the particle. Let t1 be the time taken by the particle to cover first half of the distance. Then t1=S/2v1=S2v1 Let t2 be the time taken by the particle to cover remaining half of the distance. Then t2=S/2v2=S2v2Average speed,vav= Total distance travelled Total time taken =St1+t2=SS2v1+S2v2=2v1v2v1+v2Talk to our academic expert!
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A boy walks to his school at a distance of 6 km with constant speed of 2.5 km/h and walks back with a constant speed of 4 km/h. His average speed for the round trip is
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