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Work, Energy, Power and Collision question bank (Physics)

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Q1.

Consider the following statements $A$ and $B$. Identify the correct choice in the given answers.
$A$. In an inelastic collision,there is no loss in kinetic energy during collision.
$B$. During a collision,the linear momentum of the entire system of particles is conserved if there is no external force acting on the system.

(A)

Both $A$ and $B$ are wrong.

(B)

Both $A$ and $B$ are correct.

(C)

$A$ is wrong and $B$ is correct.

(D)

$A$ is correct and $B$ is wrong.

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Q2.

$A$ rubber ball is dropped from a height of $5 \ m$ on a planet,where the acceleration due to gravity is not known. On bouncing,it rises to $1.8 \ m$. The ball loses its velocity on bouncing by a factor of

(A)

$\frac{16}{25}$

(B)

$\frac{2}{5}$

(C)

$\frac{3}{5}$

(D)

$\frac{9}{25}$

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