Aball thrown horizontally from a point 30.0 m above the ground strikes the ground after travelling a horizontal distance of 18.0 m. with what speed was it thrown? (g = 9.8 m/s²)

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.