Which types of changes observe the law of conservation of mass?
A.only changes of state
B.only physical changes
C.only chemical changes
D.physical changes and chemical changes
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Ответ:
The correct answer is actually D
Explanation: i got it right on my district assignment! :)
Ответ:
55 N
Explanation:
Assuming no potential energy changes.
The work applied increases the kinetic energy.
Fd = ½mv²
F = mv²/2d = 0.145(39²) / (2(2.0)) = 55.13625 ≈ 55 N