The device shown is used as an accelerometer and consists of a 4-oz plunger A which defl...

The device shown is used as an accelerometer and consists of a 4-oz plunger A which deflects the spring as the housing of the unit is given an upward acceleration a. Specify the necessary spring stiffness k which will permit the plunger to deflect 1/4 in. beyond the equilibrium position and touch the electrical contact when the steadily but slowly increasing upward acceleration reaches 5g. Friction may be neglected.