A truck on a straight road starts from rest and accelerates at 1.4 m/s 2 until it reaches a speed of 22 m/s. Then the truck trav
1 answer:
Answer:
42.11 sec
Explanation:
In first part : The truck start from the rest that is u = 0 m/sec
Acceleration is given as
It reaches to a velocity of 22 m/sec so v=22 m/sec
Now according to first law of motion
In second part : The truck maintain a constant speed for 22 sec
In third part : The truck takes an additional 4.4 sec for stopping
So total time in which the truck is in motion =15.71+22+4.4=42.11 sec
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Answer: Equal number of protons and electrons. Example: an atom of oxygen atom has 8 electrons and 8 protons and is neutral.
Explanation:
An atom that has no charge is a neutral atom. It contains electrons equal to protons. For example: A neutral atom of oxygen has 8 protons and 8 electrons.
An atom which has charge is said be ionized. It is either positively charged or negatively charged. It is positively charge when the number of electrons is less than the number of protons. For example: contains 10 electrons and 11 protons.
And when the number of electrons is greater than the number of protons, the atom is negatively charged. For example, has 17 protons and 18 electrons. It readily accepts an electron to complete its octet.