The above by Fizzy_Cyst is what I was doing too, but it is an answer well smaller than the one leehuan said is apparently the right answer.
It would be:
mgh – 1/2 mv^2 = m(g – 1/2 v^2) (as h = 1)
= 0.1 * (g – 1/2 v^2).
Since v = 3.8, v^2 = (4 – 0.2)^2 = 16 – 1.6 + 0.04 = 14.44 (didn't have calculator on hand lol).
So we'd get the answer to be: 0.1 (9.8 – 7.22) =~ 0.1*(2.6) = 0.26. So the answer is much smaller than B), and should be D) I think... . leehuan, how do you know the answer is B)? Was there any working too, or just the answer given?