According to this equation, f=ma, how much force is needed to accelerate an 82-kg runner at 7.5m/s2?
a.
615 n
b.
10.9 n
c.
615 m/s
d.
10.9 m/s

What do the atoms of elements in the same group have in common? a. they have the same atomic numbers. b. they have the same average atomic masses. c. they have the same number of electron shells. d. they have the same number of electrons in their outermost shells.