a child goes down the slide, starting from rest. if the length of the slide is 2m and it takes the child 3 seconds to go down th
1 answer:
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1) Distance: 9 m, displacement: +5 m
2) The average speed is 3 m/s
3) The average velocity is +2 m/s
Explanation:
1)
We start by reminding the definitions of distance and displacement:
- Distance: it is the total length of the path covered by an object, regardless of the direction of motion
- Displacement: is the distance in a straight line between the initial position and final position of motion
Let's now analyze the motion represented in the figure:
Initial position:
Intermediate position:
Final position:
Therefore, the distance covered is
While the displacement is:
2)
The average speed is a scalar quantity defined as
where
d is the distance travelled
t is the time taken
For the object in this problem,
d = 6 m
t = 2 s
Substituting, we find the average speed:
3)
The average velocity is a vector quantity defined as
where
d is the displacement
t is the time interval
For the object in this problem,
d = +12 m
t = 6 s
Substituting, we find the average velocity:
Where the positive sign + indicates the direction of the velocity vector.
Learn more about average speed and average velocity:
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Answer:
Option e) 320 s
Explanation:
Here, distance = 3.0 km = 3000 m
The velocity of boat when it is going upstream;
Upstream velocity = velocity of boat in still water - velocity of river flow
So, Upstream velocity
So,Time to go upstream
The velocity of boat when it is going downstream;
Downstream velocity = velocity of boat in still water + velocity of river flow
So, Downstream velocity
So,Time to go downstream
So, total time (t) =
Option E is the correct answer.