10. Previous to electronic timing devices, a ballistic pendulum was used to determine the muzzle velocity of a firearm. A bullet is shot at a stationary block of wood, suspended from the ceiling by wires. When the bullet hits the block of wood, it embeds itself in it and the system swings upward, gaining vertical height. A 1.75 x 102 kg bullet from a pistol strikes a 2.10 kg ballistic pendulum. Upon impact, the pendulum swings upward and gains a vertical height of 0.312 m. A. The muzzle velocity of the pistol is a.bc x 10 m/s (only provide the values for a, b, c, and d). B. Two of the physics principles numbered on the Alberta Education Data Booklet must be used to determine the speed at which the bullet leaves the pistol. The two principles, in the order in which they are used, are: Number: a b and Physics Principle: used first used second