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Mechanical Engineering - Engineering Mechanics - Discussion

Discussion Forum : Engineering Mechanics - Section 2 (Q.No. 31)
Engineering Mechanics
31.
Which of the following statement is correct?
The kinetic energy of a body during impact remains constant.
The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact.
The kinetic energy of a body before impact is less than the kinetic energy of a body after impact.
The kinetic energy of a body before impact is more than the kinetic energy of a body after impact.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
13 comments Page 2 of 2.
Paresh said:   1 decade ago
If losses are considered then D is the answer,

But if the collision is perfectly elastic then B is correct as per conservation of energy.
Chetan patel said:   1 decade ago
Loss of KE. Takes place during impact so KE. Before impact is more than KE after impact.
JOHN said:   1 decade ago
My knowledge is that every object at rest posses a potential energy. In addition to this, I just wonder how possible it may be for a body that a body that just had a collision posses lesser energy when at its initial kinetic energy before collision.
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