Select the correct answer.
Which particles make up the nucleus of an atom?
O A.
protons and electrons
OB.
neutrons and electrons
O C.
protons only
OD.
protons and neutrons
O E.
neutrons only
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Ответ:
OD. Protons and neutrons
Explanation: They are both in the nucleus. The electrons are outside.
Ответ:
65.59 m /s
Explanation:
Initial velocity u = 4.73 m/s
Final velocity v = ?
time t = 6.21 s
acceleration = g = 9.8 m /s
v = u + gt
= 4.73 + 9.8 x 6.21
= 65.59 m /s .