Which of the following are molecules? A. Al B. Ag C. MgCl2 D. NaCl E. C3H8
1 answer:
Answer: The correct options are (C)(D) and (E).
Explanation:
Molecules is defined as group of two or more numbers of atoms of same or different elements. For example: etc.
is a molecule made up of one magnesium and two chlorine atoms.
NaCl is molecule made up of one sodium and one chlorine atom
is molecule made up of three carbon atoms and eight hydrogen atoms.
Hence, the correct options are (C)(D) and (E).
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Answer:
a) 0 metres
b) From time 0 s to 10 s , the car was accelerated. Its velocity accelerated from 0m/s to 20 m/s
c) 20 m/s
Explanation:
a) <em>Formula of displacement= velocity x time</em>
time=40 s
velocity =0 m/s
∴ displacement= 0 x 40 = 0 m
Magnitude of displacement is 0 m
b) The increase in velocity shows that there has been acceleration.
c) The average velocity of the car is = {initial velocity + final velocity}
=
=20
Therefore, the magnitude of the average velocity of the car is 20 m/s