I believe the answer is C.
The reaction force exhibited by the leash is 10N
Answer:
(vf-v0)/t
vf=0 ...since it stops finally
v0=28 m/sec
t=1.6 sec
a=(0-28)/1.6
a=-17.5 m/s^2
so B is the answer,since magnitude is asked you neglect the negative.
notice that D is in m/sec(velocity unit)
The answer to this is RNA polymerase.
