It d is the depth to which a bullet of kinetic energy K can penetrate into a human body of modulus of elasticity E. Then using the method of dimension establish a relation between d, K and E. If K=cdxEy, where c is a dimensionless constant. Modulus of elasticity = Force  Area ×lΔl  (where l is length and ∆l is change in length). The value of x + y is _________