Sir I am not getting the tension in the spring so plz sir can u help me to solve this prblm qustn no 10
Problem not clear
Please attach picture not video. Basically, you can take assume that at highest point velocity of mass was zero as question doesnt give that. Now, at lowest point, total tension will be mv*v / r ( centripetal acceleration ) + mg (weight)
from conservation of energy, 0.5 m v*v (KE) = Delta PE = diameter * m * g = 2lmg
Now, solve both equations and apply young's modulus formula to get strain.