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Question

A boy runs along a straight path for the first half distance with a velocity v1 and the second half distance with a velocity v2. The mean velocity V is given by


A
2V=1v1+1v2
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B
V=v1+v22
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C
V=v1v2
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D
v1+v2
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Solution

The correct option is C 2V=1v1+1v2
Vavg=total distancetotal time
Total distance = d + d = 2d
time = t1+t2
t1=dv1t2=dv2
Vavg=2v1v2v1+v2 
 

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