Question

How many significant figures are there in 4200 kg?

Answer 1

Answer is 4

All zeros to the right of the last rightmost non-zero digits are not significant. For e.g. in 2020 there are 3 significant figures.

All zeros to the right of the last non-zero digit are significant if they come from the measurement
. For e.g. If the distance between two points is measured 2020 cm (measured to nearest centimeter) then in this number there are four significant figures.