Question

1. the graph shows the speed traveled by a vehicle over a period of time. choose the statement that most directly reflects the graph below. a. the speed increases at a constant rate at first. then the speed stays the same for a while before decreasing at a constant rate. b. the speed increases at a faster rate at first. then the speed stays the same for a while before decreasing at a constant rate. c. the speed decreases at a constant rate at first. then the speed stays the same for a while before increasing at a faster and faster rate. d. the speed decreases at a constant rate at first. then the speed stays the same for a while before increasing at a constant rate.

Explanation:

Step1: Analyze the first part of the graph

The first part of the speed - time graph has a positive slope. In a speed - time graph, the slope represents acceleration. A positive slope means the speed is increasing. If the slope is constant (straight line), the speed is increasing at a constant rate.

Step2: Analyze the middle part of the graph

The middle part of the graph is a horizontal line. In a speed - time graph, a horizontal line (slope = 0) means the speed is constant (stays the same).

Step3: Analyze the last part of the graph

The last part of the graph has a negative slope. A negative slope in a speed - time graph means the speed is decreasing. If the slope is constant (straight line), the speed is decreasing at a constant rate.

Answer:

C. The speed decreases at a constant rate at first. Then the speed stays the same for a while before increasing at a constant rate.