Answer all problems in the space provided. Show your work. 1. A 80.0 kg model planc is travelling at an elevation of 30.0 m with a speed of 15 m/s. Without using its motor, the plane rises its nose straight up until it stalls and has no speed. It falls back down afterwards. Ignore air resistance. (a) (1 point) With respect to the ground, what is the total mechanical energy of the model plane when it begins to rise? (b) (2 points) With respect to the ground, what is the maximum height of the planc? (c) (2 points) Assuming the plane's motor does not restart, what speed will the plane have when it is 15 m high