Two identical cars X and Y, each of mass 1500kg, move with a speed of 20m/s on a straight road. Car X travels due east, while car Y travels due west. Which option best describes their momenta?
a) Equal magnitudes and same directions
b) Unequal magnitudes and opposite directions
c) Equal magnitudes but opposite directions
d) Unequal magnitudes but opposite directions (based on v=40m/s)