A ballistic pendulum is a device used to measure the velocity of a projective-for example,the muzzle velocity of a rifle bullet.the projective is shot horizontally into and becomes embedded in the bob of a pendulum. The pendulum swings upword to some height(h),which is measured. The masses of the block and the bullet are known.using the laws of momentum ande enrgy, show that the initiela speed of the projectile is given by Vo = [(m+M)/m] 2gh.