80 Juan serves a tennis ball
. He throws the tennis ball into the air and hits it with his racket when it reaches its
highest point Once he hits the ball
, it moves forward and downward, eventually hitting the ground after it goes
over the net
. At which point is kinetic energy converted to gravitational potential energy
?
A just before Juan throws the bal
B just after Juan throws the ball into the air
Cust after juan hits the tennis ball
D just before the tennis ball hits the ground

b

Explanation:

he throws the ball into the air

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.