When is the average velocity of an object equal to the instantaneous velocity? A) always B) never C) only when the velocity is constant D) only when the velocity is increasing at a constant rate E) only when the velocity is decreasing at a constant rate.Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity? A) The average speed can be less than, greater than or equal to the magnitude of the average velocity. B) The instantaneous speed is always equal to the magnitude of the instantaneous velocity. C) The average speed is always less than or equal to the magnitude of the average velocity. D) The instantaneous speed is always greater than or equal to the magnitude of the instantaneous velocity. E) The average speed is always one-half the magnitude of the average velocity.Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration. A) The acceleration must be constantly increasing. B) The acceleration must be constantly decreasing. C) The acceleration must be a constant non-zero value. D) The acceleration must be equal to zero. E) A statement cannot be made without additional information.At a given instant, the acceleration of a certain particle is zero. This means that A) the velocity is constant. B) the velocity is increasing. C) the velocity is decreasing. D) the velocity is not changing at that instant. E) the velocity is zero.

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When is the average velocity of an object equal to the instantaneous velocity?
A) always
B) never
C) only when the velocity is constant
D) only when the velocity is increasing at a constant rate
E) only when the velocity is decreasing at a constant rate

Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity?
A) The average speed can be less than, greater than or equal to the magnitude of the average velocity.
B) The instantaneous speed is always equal to the magnitude of the instantaneous velocity.
C) The average speed is always less than or equal to the magnitude of the average velocity.
D) The instantaneous speed is always greater than or equal to the magnitude of the instantaneous velocity.
E) The average speed is always one-half the magnitude of the average velocity.

Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration.
A) The acceleration must be constantly increasing.
B) The acceleration must be constantly decreasing.
C) The acceleration must be a constant non-zero value.
D) The acceleration must be equal to zero.
E) A statement cannot be made without additional information

At a given instant, the acceleration of a certain particle is zero. This means that
A) the velocity is constant.
B) the velocity is increasing.
C) the velocity is decreasing.
D) the velocity is not changing at that instant.
E) the velocity is zero.

EXPERT ANSWER

When is the average velocity of an object equal to the instantaneous velocity?
A) always
B) never
C) only when the velocity is constant
D) only when the velocity is increasing at a constant rate
E) only when the velocity is decreasing at a constant rate

Answer :C) only when the velocity is constant

Which statement is correct about the relationship between the instantaneous speed and the magnitude of the instantaneous velocity?
A) The average speed can be less than, greater than or equal to the magnitude of the average velocity.
B) The instantaneous speed is always equal to the magnitude of the instantaneous velocity.
C) The average speed is always less than or equal to the magnitude of the average velocity.
D) The instantaneous speed is always greater than or equal to the magnitude of the instantaneous velocity.
E) The average speed is always one-half the magnitude of the average velocity.

Answer :B) The instantaneous speed is always equal to the magnitude of the instantaneous velocity.

Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration.
A) The acceleration must be constantly increasing.
B) The acceleration must be constantly decreasing.
C) The acceleration must be a constant non-zero value.
D) The acceleration must be equal to zero.
E) A statement cannot be made without additional information

Answer :D) The acceleration must be equal to zero.

At a given instant, the acceleration of a certain particle is zero. This means that
A) the velocity is constant.
B) the velocity is increasing.
C) the velocity is decreasing.
D) the velocity is not changing at that instant.
E) the velocity is zero.

Answer : D) the velocity is not changing at that instant.