Write the first equation of motion. Under what condition(s) is this equation valid?

Explanation:

The first equation of motion in kinematics is given by :

.....(1)

u is initial speed

a is acceleration

v is final speed

t is time

Equation (1) is valid when the object is moving with constant acceleration. This equation gives relation between velocity and time.

beta is electron from nucleus

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

the closer the planet is to the sun, the larger the gravity