A body accelerates from rest with a uniform acceleration a for time t. The uncertainty in a is 8% and the uncertainty in t is 4%. The uncertainty in speed is :

A body accelerates from rest with a uniform acceleration a for time t.

1.	A body accelerates from rest with a uniform acceleration a for time t. The uncertainty in a is 8% and the uncertainty in t is 4%. The uncertainty in speed is :
Answer» `32%` `12%` `8%` `20%` SOLUTION :`v=u+at+impliesv=0+atimpliesv=at.` `(Deltav)/(v)XX100=+-((Deltaa)/(a)xx100+(Deltat)/(t)xx100)` `=+-(8%+4%)=+-12%` So cannot choice is `(B)`.

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A body accelerates from rest with a uniform acceleration a for time t. The uncertainty in a is 8% and the uncertainty in t is 4%. The uncertainty in speed is :

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