Robbie is having a hard time opening the metal lid on a jar of pickles. Robbie decides to run hot
water over the lid. The hot water warms up the
metal, which causes it to expand a little farther
from the jar. Now the jar is easier to open. This is
an example of
thermal expansion
O evaporation
sublimation
thermal contraction

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 believe it is c.) 1575 j.

b. is the answer hoped i