1. A car travels to the south for 100 m in 1 minute then turns to the east 120 m in 0.5 minutes. Determine the average speed of the car.

__Known:__

Total distance = 100 meters + 120 meters = 220 meters

Total time = 1 minute + 0.5 minutes = 1.5 minutes = 90 seconds

__Wanted:__ Average speed

__Solution:__

Speed formula

Average speed = total distance : total time = 220 meters : 90 seconds = 2.4 meters/second

2. A boat traveling in a straight line for a distance of 100 meters after 10 seconds. What is the average speed of the boat?

__Known:__

Distance = 100 meters

Time = 10 seconds

__Wanted____:__ Average speed

__Solution:__

Speed formula

Average speed = 100 meters : 10 seconds = 10 meters/second

3. A particle moves from point O to point B in 4 s and from B to A in 20 s. Determine the average speed of the particles.

__Known____:__

Distance of OB = 5 meters

Distance of BA = 8 meters

Time of OB = 4 seconds

Time of BA = 20 seconds

__Wanted:__ The average speed of the particles

__Solution:__

Speed formula

The average speed of the particles = total distance : total time = (5 + 8) : (4 + 20) = 13 : 24 = 0.54 meter/second