Selena took 20 seconds to swim from point A to point B at a speed of 4.5 m/s. She took 18 seconds to swim back from point A to point B.
Find Selena's average speed when she swam from Point B to Point A
(Help me get to the answer please ty)
Velocity:
v = s / t
where
v = velocity or speed ( m / sec )
s = linear distance traveled ( m)
t = time ( sec )
Selena took 20 seconds to swim from point A to point B at a speed of 4.5 m /s mean:
v = 4.5 m / sec
t = 20 sec
v = s / t
4.5 = s / 20
s = 4.5 ∙ 20 = 90 m
This mean linear distance point A to point B = 90 m
Linear distance point B to point A is also = 90 m
So for point B to point A:
v = s / t
v = 90 / 18 = 5 m / s
Thanks!
d = V * t = 4.5m/s * 20s = 90 m.
d = V * t = 90.
V * 18 = 90,
V = 5 m/s.
To find Selena's average speed when swimming from Point B to Point A, we need to calculate the total distance she traveled and divide it by the total time taken.
Let's start by finding the distance Selena traveled from Point A to Point B. We can use the formula:
Distance = Speed × Time
Selena's speed when swimming from A to B is 4.5 m/s, and she took 20 seconds. Plugging these values into the formula:
Distance (A to B) = 4.5 m/s × 20 s = 90 meters.
Now, let's calculate the distance Selena traveled when swimming from B to A. Since the distance is the same in both directions (Point A to Point B and Point B to Point A), the distance from B to A is also 90 meters.
Next, we find the total time Selena took to swim back from B to A. She took 18 seconds.
To calculate the average speed, we need to add up the distances traveled in both directions and divide it by the total time taken:
Total Distance = Distance (A to B) + Distance (B to A) = 90 m + 90 m = 180 meters.
Total Time = Time (A to B) + Time (B to A) = 20 s + 18 s = 38 seconds.
Average Speed = Total Distance / Total Time = 180 m / 38 s ≈ 4.74 m/s.
Therefore, Selena's average speed when swimming from Point B to Point A is approximately 4.74 m/s.