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In Which Of The Cases, The Ball Supposed To Be In Equilibriu...
In which of the cases, the ball supposed to be in Equilibrium, if net force on ball in each case is zero. (Here we are only talking about translation equilibrium, not rotational)
Options:
A .  Mountain
B .  Plain
C .  Valley
D .  All
Answer: Option D
:
D
Condition for any object to be in translation equilibrium is that the net force on the object must be zero. Since it is given that at all the positions the ball is at equilibrium as the net force on it is 0.

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