the black mamba is one of the world most poisonous snakes, and with the maximum speed of 18.0km/h, it is lso the fastest. suppose the mamada waiting in a hide-out sees prey and begins slithering forward it with a velocity of +18.0 km/h. after 2.0s the mamba realizes that its prey can move faster that it can. the snake then turns around slowly returns to its hide-out in 12.0s calculate: a. the mambas average velocity during its return to the hide-out. b. the mambas average velocity for the complete trip. c. the mambas average speed for the complete trip