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lisbet123085
12.12.2019 •
Physics
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).
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Ответ:
a) 0.78 s
b) 58.86m/s'
c) Galileo's law of free fall
Explanation:
a)![x = v_{i}t + \frac{1}{2}at^{2} \\3 = 0*t+\frac{1}{2} *9.81*t^{2}\\t=\sqrt{\frac{6}{9.81} }](/tpl/images/0414/7477/b529b.png)
b)At the bottom:
kinetic energy = potential energy
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
Ответ:
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