Average Speed for Two-Part Trip · PhysicsBowl 2011 #14

Physics · mechanics

Problem

A car makes a trip in two parts: Part 1: it travels a distance of

800

m at a constant speed of

4.0

m/s. Part 2: it travels a distance of

1200

m at a constant speed of

20.0

m/s. What is the average speed of the car for the entire two-part trip? (A)

7.7

m/s (B)

10.4

m/s (C)

12.0

m/s (D)

13.6

m/s (E)

17.3

m/s