Answer:
C
Explanation:
inertia is measured using momentum, and momentum is calulated with mass times velocity.
20 kg x 20 m/s= 400N
10kg x 5 m/s = 50 N
45 kg x 10 m/s = 450N
55 kg x 1 m/s = 55N
450N is the highest therefore it has the highest inertia