THIS USER ASKED 👇

What is the kinetic energy K of an electron with momentum 1.05×10−24 kilogram meters per second?Express your answer in electron volts to two significant figures.

THIS IS THE BEST ANSWER 👇

Momentum = mv elsewhere the mass of an electron and v is the velocity of the electron.

v = momentum ÷ m = (1.05 × 10∧-24) ÷ (9.1 × 10∧-31) = 1,153,846.154 m / s

kinetic energy = (mv∧2) ÷ 2 = (9.1 × 10∧-31 × 1,153,846.154∧2) ÷ 2 = (1.21154 × 10∧-18) ÷ 2 = 6.05769 × 10∧-19 J

Thus, 3.8eV from 1J = 6. 242 × 10 ^ 18