Make u the subject of the formula D=ut + kt2

To make u the subject we proceed as follows:

D=ut+kt²

subtract kt² from both sides

D-kt²=ut+kt²-kt²

This will give us:

D-kt²=ut

next we divide both sides by t

(D-kt²) / t=ut/t

this will give us

u = (D-kt²) / t

simplifying the above we get:

u=D/t-kt

Answer: u=D/t-kt