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A body accelerates from rest with a unif...

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

`32%`

B

`12%`

C

`8%`

D

`20%`

Text Solution

Verified by Experts

The correct Answer is:
B
`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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