Which particles are responsible for the electric charge of an atom? O protons and neutrons
O protons and electrons
O neutrons and molecules
O molecules and electrons

Protons and electrons

Explanation:

Protons contain a positive charge

Electrons contain a negative charge

Neutrons are neutral / no charge

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

14 days is the half-life of phosphorus-32