3. same questions as the previous problem, but for mass m just falling 3 meters in a vacuum: (a) how long does it take mass m to fall 3 meters? (b) what is its final velocity (with direction)? (c) explain what physics principle makes (b) be the same or different in problems (2) and (3).

a) 0.78 s

b) 58.86m/s'

c) Galileo's law of free fall

Explanation:

a)

b)At the bottom:

kinetic energy = potential energy

downwards

c) Galileo's law of free fall says regardless of the masses, bodies in a vacuum will fall, on the earth, at the same acceleration

3b+2

Explanation:

First your question has so many mistakes

What I understand

bracelets cost 4+5b

necklaces cost  8b+6

First we have to make an equaion

=(8b+6)-(4+5b)

simplify it

=8b+6-4-5b

=3b+2 Answer