(B) In a perfectly inelastic collision,the two bodies stick together after the collision and move with a common velocity $v$. According to the law of

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In a perfectly inelastic collision,there is complete loss of $KE$.

(B) In a perfectly inelastic collision,the two bodies stick together after the collision and move with a common velocity $v$. According to the law of conservation of linear momentum: $m_{1} u_{1} + m_{2} u_{2} = (m_{1} + m_{2}) v$ Since the combined mass moves with a common velocity $v$,the final kinetic energy is $KE_{f} = \frac{1}{2} (m_{1} + m_{2}) v^{2}$,which is not zero. Therefore,there is not a complete loss of kinetic energy in a perfectly inelastic collision; only the maximum possible loss occurs. Thus,statement $B$ is incorrect.

Class 11 Physics Work, Energy, Power and Collision Mix Examples-Work, Energy, Power and Collision

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Which of the following statements is incorrect?

A
Most of the collisions on the macroscopic scale are inelastic collisions.
B
In a perfectly inelastic collision,there is complete loss of $KE$.
C
Forces involved in an elastic collision are conservative in nature.
D
Oblique collision is that collision in which the colliding bodies do not move along the same straight line path.

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Work, Energy, Power and Collision

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Mix Examples-Work, Energy, Power and Collision

$A$ body starts moving unidirectionally under the influence of a source of constant power. Which one of the graphs correctly shows the variation of displacement $(s)$ with time $(t)$?

MediumNEET 2017

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$A$ bullet of mass $0.01 \, kg$ travelling at a speed of $500 \, m/s$ strikes a block of mass $2 \, kg$ which is suspended by a string of length $5 \, m$. The center of gravity of the block is found to rise a vertical distance of $0.1 \, m$. What is the speed of the bullet after it emerges from the block?

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Two bodies $A$ and $B$ of masses $2m$ and $m$ are projected vertically upwards from the ground with velocities $u$ and $2u$ respectively. The ratio of the kinetic energy of body $A$ and the potential energy of body $B$ at a height equal to half of the maximum height reached by body $A$ is (in $ : 1$)

MediumAP EAMCET 2024

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Assertion $(A)$: When we bounce a ball on the ground, it comes to rest after a few bounces, losing all its energy. This is an example of violation of conservation of energy.
Reason $(R)$: Energy can change from one form to another but the total energy is always conserved.
Which of the following is true?

EasyTS EAMCET 2018

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$A$ pendulum of length $2 \; m$ consists of a wooden bob of mass $50 \; g$. $A$ bullet of mass $75 \; g$ is fired towards the stationary bob with a speed $v$. The bullet emerges out of the bob with a speed $\frac{v}{3}$ and the bob just completes the vertical circle. The value of $v$ is $\dots \; ms^{-1}$. (if $g = 10 \; m/s^2$)

DifficultJEE MAIN 2022

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Which of the following statements is incorrect?

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$A$ body starts moving unidirectionally under the influence of a source of constant power. Which one of the graphs correctly shows the variation of displacement $(s)$ with time $(t)$?

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