3 masalah dan penyelesaian tentang persamaan Kelajuan
1. Sebuah kereta bergerak ke selatan sejauh 100 m dalam 1 minit kemudian membelok ke timur sejauh 120 m dalam 0.5 minit. Tentukan laju purata kereta itu.
Diketahui:
Jumlah jarak = 100 meter + 120 meter = 220 meter
Jumlah masa = 1 minit + 0.5 minit = 1.5 minit = 90 saat
Dikehendaki: Kelajuan purata
penyelesaian:
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?
Diketahui:
Distance = 100 meters
Time = 10 seconds
Dikehendaki: Kelajuan purata
penyelesaian:
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.
Diketahui:
Distance of OB = 5 meters
Distance of BA = 8 meters
Time of OB = 4 seconds
Time of BA = 20 seconds
Dikehendaki: The average speed of the particles
penyelesaian:
Speed formula
The average speed of the particles = total distance : total time = (5 + 8) : (4 + 20) = 13 : 24 = 0.54 meter/second
