A students walks one hour. She walks 4 blocks east and 2 blocks west. Her average velocity is?
1 answer:
Let us consider the following figure
<em>figure</em><em> </em><em>is</em><em> </em><em>in</em><em> </em><em>pict</em><em>ure</em>
So, his/her total displacement = 2 blocks.
total time = 1 hour
Average Velocity
= Total displacement/ total time
= 2 blocks/ 1 hour
= 2 blocks/ h
So, her/his average velocity is 2 blocks per hour.
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The speed of a electron that is accelerated from rest through an electric potential difference of 120 V is
We know, that the energy of the system is always conserved.
Using the Law of Conservation of energy,
U=0
Here, K is the kinetic energy and U is the potential energy.
Now, substituting the formula of U and K, we get:
=0------(1)
Here,
m is the mass of the electron
v is the speed of the electron
q is the charge on the electron
V is the potential difference
Let and
represent the final and initial speed.
Here, =0
Solving for , we get:
=6.49m/s
To learn more about the conservation of energy, refer to:
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