1. a 26 kg cannon ball is fired from a cannon with muzzle speed of 962 m/s at an angle of 19.2 ◦ with the horizontal. the acceleration of gravity is 9.8 m/s 2 . use conservation of mechanical energy to find the maximum height reached by first ball. answer in units of m.2. a second identical ball is fired at an angle of 144◦ . what is the total mechanical energy at the maximum height of the second ball. answer in units of j.