57.
A body moving in a straight line covers half of the total distance with speed v and other half is covered with speed V.
for hall the time and with speed V. for other half of the time. The average speed of the whole journey is
2V(V.V.) V(V, +V,)
2VV,V,
2VV,V,
(A) 2V +V, + v,
(B) 2V +V, + v, (C) 2V + V, + v. (0) V+V, + v.
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