Asystem releases 255 cal of heat to the surroundings while delivering 428 cal of work. what is the change in internal energy of the system (in cal)?

The record distance in the sport of throwing cowpats is 81.1 m. this record toss was set by steve urner of the united states in 1981. assuming the initial launch angle was 45° and neglecting air resistance, answer the following. (a) determine the initial speed of the projectile. m/s