What do u mean by the activity series of metals ??
1 answer:
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This question involves the concept of kinetic energy.
The student's claim is "right".
<h3>Kinetic Energy</h3>The energy possessed by a body, by the virtue of its motion is called kinetic energy. Mathematically it is given by the following formula:
where,
- K.E = Kinetic energy
- m = mass
- v = velocity
Therefore,
For the paintball:
K.E = 16200 J
For the pellet:
K.E = 16200 J
Hence, both paintball and pellet will have same kinetic energy. The student is right.
Learn more about kinetic energy here:
#SPJ1
Answer:
D.None of these
Explanation:
The derivation of acceleration formula:
Let us call the 5kg mass and the 4kg mass
. If the tension in the string is
then for the mass
(1). <em>(the negative sign on the right side indicates that acceleration is downwards)</em>
And for the mass
(2). <em> (the acceleration is upwards, hence the positive sign)</em>
Solving for in the 2nd equation we get:
,
and putting this into the 1st equation we get:
Back to the question:
Using the formula for the acceleration we find
which is the acceleration that none of the given choices offer. Also, the acceleration of the two blocks is the same, because if it weren't, the difference in the instantaneous velocities of the objects would cause the string to break. Therefore, these two reasons make us decide that none of the choices are correct.