What is a correct SI base unit for the gradient of this power–time graph?
kg m2s−2\text{kg m}^2 \text{s}^{-2}kg m2s−2
kg m2s−3\text{kg m}^2 \text{s}^{-3}kg m2s−3
kg m2s−4\text{kg m}^2 \text{s}^{-4}kg m2s−4
kg m s−3\text{kg m s}^{-3}kg m s−3
