Most Important Selected Qs for JEE AdvancedPhysicsWork, Power and Energy
A block of mass 2 kg is tied to elastic thread of length 2 m and suspended to point O. Initially block is horizontal level to this point O . Now block is released and its speed is 5 ~m / s when thread is vertical. If the acceleration of the block at the lowest position is 2.5 K . Find the value of K .
Correct answer
7
Step-by-step solution
M.E. Conservation aligned & m g(4)- k 2 x^2= 1 2 m v^2 & k x=55 & -m g+k x=m a & 55-20=2 a & a=17.5 ~m / sec ^2 aligned