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Question

For a body moving with uniform acceleration a, initial and final velocities in a time interval t are u and v respectively. Then, its average velocity in the time interval t is :

A
(v+at2)
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B
(vat2)
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C
(vat)
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D
(u+at2)
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Solution

The correct options are
B (vat2)
D (u+at2)
S=ut+12at2
v=u+at
Average velocity =Total displacement(s)Total time(t)=ut+12at2t=u+12at
Substitute, u=vat in the above expression:
We get average velocity =vat+12at=v12at
Thus, two options are correct.

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