Two students are moving a heavy box down a hallway. Student A exerts a force of 30 Newtons on the box. Student B exerts a force of 15 Newtons in the same direction. a
2 Newtons

b
15 Newtons

c
45 Newtons

d
450 Newtons

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.

indium, and thallium have three electrons i think

the answer is d. 74.02