The Speed of a Bullet with a Mass of 0

Multiple Choice

The speed of a bullet with a mass of 0.050 kg is 420 m/s with an uncertainty of 0.010 %. What is the minimum uncertainty in the bullet's position if it is measured at the same time as the speed is measured?

A) 2.5 × 10^-31 m
B) 5.0 × 10^-32 m
C) 7.5 × 10^-33 m
D) 2.5 × 10^-34 m
E) 6.0 × 10^-36 m