What is the average acceleration of a jet ski that goes from rest to 10 m/s west in 4 s? take the direction west to be positive, and east to be negative.

a.
2.5 m/s2

b.
-2.5 m/s2

c.
0.4 m/s2

d.
-0.4 m/s2
whats the answer i need

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation:

elements

explanation:

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