Plz me fast i will give two vehicles are traveling down the highway going 40 mph. which has more kinetic energy and why? a 2000kg car going 40 mph a 4000 kg bus going 40 mph explain:

A 4000 kg bus going 40 mph has more kinetic energy than a 2000kg car going 40 mph. tis cuz' KE=1/2*mass*velocity^2 so bus has higher 2x mass of car n 2x KE, even thou their speed is the same.

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.