5. Bradley rode his bike 14.2 km in 2.3 hours Calculate his average speed.

His average speed is equal to total distance divided by total time:

12.2km / 2.3 hours

= 5.3 km/h

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

Each student aligns the edge of the object with the left edge of the ruler as shown above. all four students read the ruler with a measurement of 4.6 cm. which statement describes the data they collect? i believe the answer is: the data have poor precision and poor accuracy because of a systematic error.