8. CBQ - Speed-time graph

Question:

4 m.

Read the following case and answer the following questions:

A \(1000\ kg\) car moves along a straight road. The speed–time graph shows that the car starts from rest, accelerates uniformly from \(0\) to \(15\ m/s\) during the first \(2\ seconds\), then moves with constant speed (\(15\ m/s\)) from \(2\ s\) to \(5\ s\). Finally, it slows down uniformly and comes to rest at \(6\ s\). Based on the graph, answer the following questions.

1. During which time interval does the maximum force act on the car?

From \(0\ s\) to \(2\ s\)
From \(5\ s\) to \(6\ s\)
From \(2\ s\) to \(5\ s\)
During the entire \(6\ s\)

2. During which time interval is the net force acting on the car equal to zero?

During the entire \(6\ s\)
From \(5\ s\) to \(6\ s\)
From \(0\ s\) to \(2\ s\)
From \(2\ s\) to \(5\ s\)

3. What is the displacement of the car during the first \(2\ seconds\)?

\(15\ m\)
\(20\ m\)
\(10\ m\)
\(30\ m\)

4. Which statement best describes the motion of the car during the last one second (\(5\ s\) to \(6\ s\))?

The car experiences an unbalanced force opposite to its direction of motion, causing it to come to rest.
The car has zero acceleration because it is slowing down.
The car experiences balanced forces and moves with constant velocity.
The car continues moving because no force acts on it.

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