Question

The kinetic energy of an object is given by the formula E = mv2. If m is in kg and v is in m/s,

then E is in joules. What is the kinetic energy of an electron (mass = 9.1 x 10-31kg) travelling at a
fifth of the speed of light (speed of light, c = 3 x 108m/s)?

Answer 1

9.553×10^-26

Explanation:

m= 9.1 ×10 ^-31

v = 3 × 108

= ( 9 .1 × 10 ^- 31) × ( 3 × 108 ) ^2

= 9 .552816 × 10 ^ -26

approximately

9.553×10 ^26