During a siege in the Middle Age the defenders could count on solid 9.5 m-tall walls (even if it sounds unrealistic, for this problem you can assume the wall has no thickness). They placed a ballista on the battlements to keep the enemy distant. (a-> 4 pts.) If the ballista shoots minimum safety distance from the wall for the sieging army? (b->5 pts.) The attackers dart with initial velocity vo 90 m/s, what is the %3D place a catapult 1050 m away from the wall planning to destroy the ballista. The catapult has a fixed launch angle of 60 but the crew can adjust the tension of the ropes to achieve the velocity of the projectile (a large rock). At what velocity should they launch the rock in order to hit the ballista?