Question

If displacement of a body, s = (200 + 5) meters and
time taken by it t = (20 + 0.2) seconds, then find the
percentage error in the calculation of velocity.
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Answer 1

v=s/t

v=200/20

v=10

∆s=+-5 ∆t=+-0.2

∆v/v=∆s/s+∆t/t

∆v/v=5/500+0.2/20=0.025+0.01=0.035

∆v=10*0.035=0.35

percentage error in %

0.035*100=3.5%