stereotype is defined as a widely held but fixed and oversimplified image or idea of a particular type of person or thing.
The answer is:
The dwarves doubt Bilbo's abilities as a burglar because he is a hobbit
acceleration a = v - u / t = 25 - 13 / 6 = 2 m/s^2
so that distance travelled S = v^2 - u^2 / 2 a = 25 x25 - 13 x13 / 2 x 2 = 114 m.
Yes you do need carbon dioxide and water