In elastic collision, I. initial kinetic energy is equal to the final kinetic energy. II. kineti...

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In elastic collision,
I. initial kinetic energy is equal to the final kinetic energy.
II. kinetic energy during the collision time \( \Delta t \) is constant.
III. total momentum is conserved.
Which of the above statement(s) is/are correct?
(a) Only I
(b) Both I and III
(c) Only III
(d) Only II
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