Question no. 5th
Answer -(A) 2tan-1(2)
answer is 1st option # I am also getting 2nd option .
Can you send solution by using only energy conservation or something near to that !?
@kirito There is not at all any use of conservation principle here...and also it can't be used as we don't know how much time the cylinder is accelerated in order to reach the final position.
By using the force equivalence,we can do as follows: