What distance will a car cover accelerating from 12 m/s to 26 m/s in 14 sec?

What statements accurately describe atoms

Positrons are spontaneously emitted from the nuclei of

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.