Which of the following has the largest kinetic energy? a. a 10kg dog running down the street at 30mph b. a tightrope walker slowly crossing niagara falls c. a 0.02kg bullet moving down the barrel at 800mph d. a semi truck parked in a parking lot

Option C,

Reason

Kinetic energy is proportional to the square of velocity. Thus the higher the velocity the higher will be the kinetic energy

K.E. dog = 1/2 x 10 x (0.44704 x 30)^2 m/s = 899.14 J

K.E. bullet = 1/2 x 0.02 x (0.44704 x 8000)^2 m/s = 127,878 J

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge