As part of a circus act, Dimitri, a 136 kg strongman, catches cannonballs fired at his chest. If a 34 kg cannonball is fired toward Dimitri with a speed of 20 mph
(32 km/h), with what speed does the combination of Dimitri and the cannonball
tumble backward, once the cannonball is caught?

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.