1i think it should be A,think SHM,object at extremes
Assertion: A body can have acceleration even if its velocity is Zero at a given instant of time.
Reason: A body is momentarily at rest when it reverses its direction of motion.
THE CHOICES ARE SAME AS THAT IN THE JEE PAPERS!
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11 Answers
3option A.
becos reverse its direction dat it is acceleratd and it is momentarily at rest means velocity is zero therefore it explains the first statement i think so.pls inform me if there are ne errors.
24I:A body can always have a rate of change of quantity even if that quantity has value zero.So Assertion correct
II:A body is momentarily at rest when its direction changes .So Reason is also correct
but I dont think that A explains R.......
1till now i cited a few explamples all in favor of Ans A
1.extreme posn in shm
a=amax
v=0
2.a projectile at its topmost height
a=amax
v=0
however the answers given have an assumption that the acch is const. else nothinng canbe said
else the v-t graph can be
then the ans would be Asser. true and reason is false
1Answer should be A
see... in case of a body projected upwards, at d highest point, its velocity is zero but its accelaration is equal to g...
n more over... when will a body reverse its direction...!! only in presence of external force rite... dat implies, its under accelerated motion rite... so if a body is reversing its direction of motion, it means dat some force is acting on it which means it has some acceleration... n while its direction gets reversed, its velocity is momentarily zero...
so II explains I ...