In the figure, mass of a ball is 
times mass of the rod. Length of rod is 1 m. The level of ball is same as rod level. Find out time taken by the ball to reach at upper end of rod.
Text Solution
Verified by ExpertsThe correct answer is:
B
Let 
and 
be accelerations of a ball (upward) and rod (downward), respectively.
Clearly, from the diagram,
…(i)
Now, for the ball,
…(ii)
and for the rod, 
….(iii)
On solving Eqs. (i), (ii) and (iii), we get
So, acceleration of ball w.r.t. 
Now, displacement of ball w.r.t. rod when it reaches the upper end of rod is 1 m.
Using second equation of motion, 
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