PHYSICS
posted by applebottom .
(1 pt) An aricraft carrier has a mass of 8.9 x10^7kg and can cruise at 55 km/h.
a) What is the work required to stop it?
J
b) What constant force could stop it in 6 km?
N
a) If only half of the work required to stop it is done, what is its final speed?
km/h

is this from a webwork?

i d not know
lol 
i have the same quickly
plz we neeeeeeeeeeeeeeeed help 
a) convert km/h to m/s, use 1/2mv^2
b) divide a) by (the distance in meters)
c) divide the answer in a) in half and isolate v 
for c) you can just directly calculate 1/2mv^2 without converting to m/s, divide the energy and then isolate v

Someone help for c idont get it