Value of variable given others in formulae
u=20, t=1.2, k=-5
D= ut + kr2
(a) Work out the value of D.
The answer I got for this is 16.8 which is most likely incorrect because I have never learnt how to answer this question so I used my knowledge of other things and tried it, I know for part b you have to rearrange formulae which i cant do so help is very appreciated.
(b) D = 50
t = 5
k = -5
-Work out the value of u (for the formula I wrote above part a)
Apologies I have written this in quite a confusing way