Car A travels with speed v around curve number one, which has a radius r. Car B

Question

travels with speed 2v around curve number two, which has a radius 2r. What is the ratio
of the two accelerations A/B?
A) 2
B) 4
C) 1/2
D) 1/4
E) 1

Answer 1

acceration1=v^2/r

acceleration2=4v^2/2r=2acceleration1

So it looks like a/B=1/2