Six steel balls of identical size are lined up long a straight frictionless groove. Two similar balls moving with a speed $V$ along the groove collide with this row on the extreme left hand then
Six steel balls of identical size are lined up long a straight frictionless groove. Two similar balls moving with a speed $V$ along the groove collide with this row on the extreme left hand then
- A
all the balls will start moving to the right with speed $V/8$ each
- B
all the six balls initially at rest will move on with speed $V/6$ each and two identical balls will come to rest
- C
two balls from the extreme right end will move on with speed $V$ each and the remaining balls will remain at rest
- D
one ball from the right end will move on with speed $2V$, the remaining balls will be at rest
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At high altitude, a body explodes at rest into two equal fragments with one fragment receiving horizontal velocity of $10 \,m/s$. Time taken by the two radius vectors connecting point of explosion to fragments to make $90^o $ is ............ $\mathrm{s}$
At high altitude, a body explodes at rest into two equal fragments with one fragment receiving horizontal velocity of $10 \,m/s$. Time taken by the two radius vectors connecting point of explosion to fragments to make $90^o $ is ............ $\mathrm{s}$
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It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is $p_d $ ; while for its similar collision with carbon nucleus at rest, fractional loss of energy is $P_c$. The values of $P_d$ and $P_c$ are respectively
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- [JEE MAIN 2018]
A bullet when fired at a target with a velocity of $100\,\,m/sec$ penetrates one metre into it. If the bullet is fired at a similar target with a thickness $0.5\,\,metre,$ then it will emerge from it with a velocity of
A bullet when fired at a target with a velocity of $100\,\,m/sec$ penetrates one metre into it. If the bullet is fired at a similar target with a thickness $0.5\,\,metre,$ then it will emerge from it with a velocity of
$Assertion$ : If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision.
$Reason$ : During collision intermolecular space decreases and hence elastic potential energy increases.
$Assertion$ : If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision.
$Reason$ : During collision intermolecular space decreases and hence elastic potential energy increases.
- [AIIMS 2015]