The motion of a particle is described in the velocity vs. time graph shown in Figure 2-1. We can say that its speed A) increases. B) decreases. C) increases and then decreases. D) decreases and then increases. E) remains constant.Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. A) The car is decelerating, and its acceleration is positive. B) The car is decelerating, and its acceleration is negative. C) The acceleration is zero. D) A statement cannot be made using the information given.An object is moving with constant non-zero velocity in the +x-axis. Suppose that a car traveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. A) The car is decelerating, and its acceleration is positive. B) The car is decelerating, and its acceleration is negative. C) The acceleration is zero. D) A statement cannot be made using the information givenThe position versus time graph of this object is A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve. E) a hyperbolic curve.

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The motion of a particle is described in the velocity vs. time graph shown in Figure 2-1. We can say that its speed
A) increases.
B) decreases.
C) increases and then decreases.
D) decreases and then increases.
E) remains constant.

Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.
A) The car is decelerating, and its acceleration is positive.
B) The car is decelerating, and its acceleration is negative.
C) The acceleration is zero.
D) A statement cannot be made using the information given.

Suppose that a car traveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.
A) The car is decelerating, and its acceleration is positive.
B) The car is decelerating, and its acceleration is negative.
C) The acceleration is zero.
D) A statement cannot be made using the information given

An object is moving with constant non-zero velocity in the +x-axis. The position versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axis.
D) a parabolic curve.
E) a hyperbolic curve.

EXPERT ANSWER

The motion of a particle is described in the velocity vs. time graph shown in Figure 2-1. We can say that its speed
A) increases.
B) decreases.
C) increases and then decreases.
D) decreases and then increases.
E) remains constant.

Answer :A) increases.

Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.
A) The car is decelerating, and its acceleration is positive.
B) The car is decelerating, and its acceleration is negative.
C) The acceleration is zero.
D) A statement cannot be made using the information given.

Answer :B) The car is decelerating, and its acceleration is negative.

Suppose that a car traveling to the West (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration.
A) The car is decelerating, and its acceleration is positive.
B) The car is decelerating, and its acceleration is negative.
C) The acceleration is zero.
D) A statement cannot be made using the information given

Answer :A) The car is decelerating, and its acceleration is positive.

An object is moving with constant non-zero velocity in the +x-axis. The position versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axis.
D) a parabolic curve.
E) a hyperbolic curve.

Answer : C) a straight line making an angle with the time axis.