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this is a conservation of energy question, the initial energy of the bullet is .5*m*v(initial)^2. The final energy is the potential energy of the block and the final energy of the bullet, i.e. the energy lost from the decrease in velocity of the bullet was transformed into the energy that was needed to raise the block 12.5 cm. As you should know, the increase in potential energy does not depend on the path taken by the object, so m*g*h works fine for the final potential energy. You have everything you need but the initial velocity which you can solve for using .5*m*v(initial)^2=m(block)*g*h+.5*m*v(fi…