A projectile of mass 0.671 kg is shot from a cannon3 at height 7 m, as shown in the gure, with an initial velocity va- having a horizontal component of 5.4 m/ s. The projectile rises to a maximum height of 4.5 m above the end of the cannon's barrel and strikes the ground a horizontal distance A3: past the end of the cannon's barrel. (6.x: / 4.5 m 00000000 _ o'c'o'o'o'o'o'o'o Find the magnitude of the initial vertical velocity vector of the cannon-ball at the end of the cannon's barrel. The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s \\l. I Find the work done by the gravitational force on the particle during its trajectory from the end of the cannon's barrel to its impact on the ground. Answer in units of J. Find the magnitude of the nal velocity vector when the particle impacts the ground. Answer in units of m/s