please answer all questions asked

66 Speed and Velocity 2. Key Question: In horizontal motion, how do we distinguish between speed and velocity and how do we represent those concepts mathematically? The role of time `Time is important when describing motion. If another person traveled the same route in the journeys on the previous page, but took more or less time, the motion would be different because their speed would be different. A number line and a grid simply show an object's position in one dimension and two dimensions respectively. We can show the effect of time by plotting a distance versus time graph or a displacement versus time graph. Distance and displacement are usually plotted along the y-axis whereas time is plotted along the x-axis. For motion in one-dimension, distance traveled will always be positive as it is cumulative. Displacement can be positive or negative depending on whether the object is going away from the starting point or going back towards the starting point. Time always runs forward and so is always positive. 1. Two horses starting at the same point and time move towards a newly filled water trough. Horse 1 trots at a steady speed 20 m to the water trough in 4 seconds. It drinks for 10 seconds. It then trots 30 m back the way it came, taking 6 seconds. Finally, it turns around again and trots 20 m in 5 seconds. Horse 2 plods at a steady speed for 20 m to the water trough and takes 8 seconds to get there. It spends 6 seconds drinking. It then gallops 30 m back the way it came in 3 seconds and remains there eating grass. (a) In two different colors, plot the movement of the horses on the displacement-time graph below: 40 30 20 Displacement (m) 10 0 -10 -20 20 0 10 15 25 Time (s) (b) What are the horses' displacements after 25 seconds? Horse 1:_ Horse 2: (c) What are the total distances the horses move during this time? Horse 1: Horse 2: (d) Describe the difference between the lines created by the displacement of the two horses in the first 4 seconds: (e) Describe the difference between the lines created by the displacement of the 2 horses between the 14 and 17 second marks of the graph