There are several ways to calculate uncertainty. You can round a decimal place to the same place as an uncertainty, put the uncertainty in proper form, or calculate uncertainty from a measurement.
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You multiply the percentage uncertainty by the true value.
If the distance is known to perfection, an acceleration is constant, then the absolute error in the calculation of acceleration is 2/t3, where t is the measured time.
WE know that ~x*~p>=h/4*3.14 and ~p= m~v so substitute value of ~p in above equqtion
Uncertainty is not being sure of something.
Some antonyms of the word 'uncertainty' are 'certainty' and 'assurance'