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1. A body describes the first half of the total 1distance with velocity v, and the secondhalf with velocity v2. The averagevelocity is:

Answer»

Let assume the distance be 2X.

By the question ,

AVERAGE VELOCITY (V)= TOTAL DISPLACEMENT / TIME TAKEN

Total displacement = 2X

Have to find time taken for the V1 and V2.

time taken for the first half = X/V1

time taken for the next half = X/V2.

substitute value in AVERAGE VELOCITY

V =2S/(X/V1 + X/V2)

take "x" common and take L.C.M

V= 2S /X( V1 + V2 )/V1 V2

V= 2S (V1 V2)/ X (V1 + V2).



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