7. A net force acting on an object causes the object to accelerate in the direction of the force; this is

a net force acting on an object causes the object to accelerate in the direction of the net force; F= ma, or A=n/m. ... When one object is sliding across one another.

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.

i do not get it   at all