JEE Advanced 2020 Full Test 5 Paper 1

Two blocks of mass m and 2m connected by a weightless spring of stiffness k rest on a smooth horizontal plane. Block of mass m is shifted to a small distance x to the left and then released. If the duration between releasing mass m and breaking off of mass 2m is ∆t, then average force(in newton) exerted by wall on mass 2m is given as ‌

x

∆t

√mkn. Find the value of n.