You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be

A) greater than 70.0 km/h.

B) equal to 70.0 km/h.

C) less than 70.0 km/h.

D) exactly 38.0 km/h.

E) cannot be determined from the information given, must also know directions traveled

Which statement is correct about the relationship between the average speed and the magnitude of the average velocity for any motion?

A) The average speed is always one-half the magnitude of the average velocity.

B) The average speed is always greater than or equal to the magnitude of the average velocity.

C) The average speed can be less than, greater than or equal to the magnitude of the average velocity.

D) The average speed is always less than or equal to the magnitude of the average velocity.

E) The average speed is always equal to the magnitude of the average velocity.

**EXPERT ANSWER**

You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be

A) greater than 70.0 km/h.

B) equal to 70.0 km/h.

C) less than 70.0 km/h.

D) exactly 38.0 km/h.

E) cannot be determined from the information given, must also know directions traveled

**Answer :**C) less than 70.0 km/h.

**Answer :**C) average velocity.

Which statement is correct about the relationship between the average speed and the magnitude of the average velocity for any motion?

A) The average speed is always one-half the magnitude of the average velocity.

B) The average speed is always greater than or equal to the magnitude of the average velocity.

C) The average speed can be less than, greater than or equal to the magnitude of the average velocity.

D) The average speed is always less than or equal to the magnitude of the average velocity.

E) The average speed is always equal to the magnitude of the average velocity.

**Answer :**B) The average speed is always greater than or equal to the magnitude of the average velocity.

**Answer : **D) instantaneous acceleration.