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
