Koto is walking at a velocity of 4.5 m/s south. she started at her house and traveled 15000 meters north, 5000 meters east, 2 meters south, and then 5000 meters west. what is her time based on her velocity? (there are 60 seconds in 1 minute.)a. 18.5 minutesb. 20.4 minutesc. 2 hoursd. 3 hours

2.78 hour ≈ 3 hours

d. 3 hours

Explanation:

Speed is defined as the rate of change of distance with time. It is measured in m/s same as velocity. However, speed is a scalar quantity having magnitude but no direction.

Mathematically,

Speed = Distance/time

As such, time = Distance/speed

Total distance covered by Koto = 15000 + 5000 + 20000 +5000

= 45,000 meters

Time = 45000/4.5

= 10,000s

Given that 60 seconds make 1 minute, 10000 seconds in minutes

= 10,000/60

= 166.67 minutes

Given that 60 minutes make 1 hour, then 166.67 minutes in hours

= 166.67/60

= 2.78 hours

≈ 3 hours

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.