the distance between two train stations is 30 km. a locomotive starting from one station gave the train an acceleration that made it reach 72km/h in 40seconds and this acceleration continued until the speed of the train reached 108km/h. This speed was maintained until brakes were applied to eventually bring the train to a stop at the second station under a uniform deceleration of 2m/s^2. How long did the entire journey take?​

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

=force × distance a. work b. velocity c. pressure d. momentum