A certain moving electron has a kinetic energy of 1.01 × 10−19 J. Calculate the speed necessary for the electron to have this energy. The mass of an electron is 9.109 × 10−31 kg. Answer in units of m/s.

Velocity of electron will be equal to

Explanation:

We have given kinetic energy of electron

Mass of electron

We have to find velocity of electron

Kinetic energy of electron is equal to , here m is mass and v is velocity

So

So velocity of electron will be equal to

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.