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Draw a graph with a maximum velocity of 10m/s and time which goes up to 20s. Then draw the line for a person who waits until t=4s. They then take 2s to accelerate to v=10m/s. They continue at this speed until t=15s. Then they decelerate and come to a stop two seconds later.Using your graph, what is the velocity at time t=5s?

Question

Draw a graph with a maximum velocity of 10m/s and time which goes up to 20s. Then draw the line for a person who waits until t=4s. They then take 2s to accelerate to v=10m/s. They continue at this speed until t=15s. Then they decelerate and come to a stop two seconds later.Using your graph, what is the velocity at time t=5s?

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Solution

To answer this question, we first need to understand the motion of the person as described and then represent it on a velocity-time graph.

  1. From t=0s to t=4s, the person is waiting. This means their velocity is 0 m/s. On the graph, this would be a horizontal line along the t-axis from 0 to 4 seconds.

  2. From t=4s to t=6s, the person accelerates to 10 m/s. This means the velocity is increasing. On the graph, this would be a line rising from the point (4,0) to the point (6,10).

  3. From t=6s to t=15s, the person continues at a constant speed of 10 m/s. On the graph, this would be a horizontal line at v=10 m/s, from t=6s to t=15s.

  4. From t=15s to t=17s, the person decelerates to a stop. This means the velocity is decreasing. On the graph, this would be a line falling from the point (15,10) to the point (17,0).

Now, to find the velocity at t=5s, we look at the graph at t=5s. At this point, the person is in the acceleration phase, and the line on the graph is rising. Since the person takes 2 seconds to accelerate from 0 to 10 m/s, their velocity at t=5s (which is halfway through the acceleration phase) would be halfway between 0 and 10 m/s.

So, the velocity at t=5s is 5 m/s.

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