MCQ
In an elastic collision:
  • A
    The initial kinetic energy is equal to the final kinetic energy.
  • B
    The final kinetic energy is less than the initial kinetic energy.
  • C
    The kinetic energy remains constant.
  • D
    The kinetic energy first increases then decreases.

Answer

  1. The initial kinetic energy is equal to the final kinetic energy.

Explanation:

As no energy is lost into heat in an elastic collision, the initial kinetic energy is equal to the final kinetic energy.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The moments of inertia of a non-uniform circular disc (of mass $M$ and radius $R$ ) about four mutually perpendicular tangents $A B, B C, C D, D A$ are $I_1, I_2, I_3$ and $I_4$, respectively (the square $A B C D$ circumscribes the circle). The distance of the centre of mass of the disc from its geometrical centre is given by
A simple pendulum is oscillating without damping. When the displacement of the bob is less than maximum, its acceleration vector $\vec a$ is correctly shown in
A stone is dropped into a pond from the top of the tower of height $h$. If $v$ is the speed of sound in air, then the sound of splash will be heard at the top of the tower after a time
$Assertion :$ Adiabatic expansion is always accompanied by fall in temperature.
$Reason :$ In adiabatic process, volume is inversely proportional to temperature.
Objects $A$ and $B$ that are initially separated from each other and well isolated from their surroundings are then brought into thermal contact. Initially $T_A= 0^oC$ and $T_B = 100^oC$. The specific heat of $A$ is less than the specific heat of $B$. After some time, the system comes to an equilibrium state. The final temperatures are :
A closed orgain pipe has length $'l’$. The air in it is vibrating in $3^{rd}$ overtone with maximum displacement amplitude $'a’$. The displacement amplitude at distance $l / 7$ from closed end of the pipe is:
The angle between vectors $(\overrightarrow {\rm{A}} \times \overrightarrow {\rm{B}} )$ and $(\overrightarrow {\rm{B}} \times \overrightarrow {\rm{A}} )$ is
A cube of wood supporting $200\,gm$ mass just floats in water. When the mass is removed, the cube rises by $2\, cm$. ............ $cm$ is the side of cube .
Which of the following ratios express pressure?
A hollow pipe of length $0.8 \mathrm{~m}$ is closed at one end. At its open end a $0.5 \mathrm{~m}$ long uniform string is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is $50 \mathrm{~N}$ and the speed of sound is $320 \mathrm{~ms}^{-1}$, the mass of the string is