The point of maximum deflection δy occurs at the center of the specimen and is described by δy=fl348ei (12.11) where e is the modulus of elasticity and i is the cross-sectional moment of inertia. what is the value of i for this specimen?

Sorry i don’t know what to do

Ibelieve that the correct answer is: c. along plate boundaries

Ke reqd to move from 0 to 50 will be proportional to 50x50 or 2500. this is equal to w.  to change vel from 50 to 150 you need energy prop to 22500 - 2500 = 20,000. this corresponds to 8w.  best answer is a) . work reqd is prop to velocity squared.