Answer:
b) a horse pulls a wagon at a constant velocity
Explanation:
As we know that ,work done is the dot product of force vector and displacement vector.
W= F.d
W=work
F=Force
d=Displacement
We also know that
F = m a
m= mass ,a = acceleration
When velocity is constant then rate of change in the velocity will be zero,then we can say that acceleration will be zero.
When a= 0 Then F= 0
W= F.d ( F=0)
W = 0
Therefore option b i correct because horse is going with constant velocity.
Complete Question
While john is traveling along a straight in interstate highway, he notices that the mile marker reads 242 km. John travels until he reaches the 147 km marker and then retraces his path to the 161 km marker. What is John's resultant displacement from the 242 km marker? How far has he traveled answer in units of km
Answer:
The resultant displacement ![\Delta x _{1 , 3} = 81 \ km](https://tex.z-dn.net/?f=%5CDelta%20x%20_%7B1%20%2C%203%7D%20%3D%2081%20%5C%20km)
The total distance traveled by john is
Explanation:
From the question we are told that
The first position of john from the finish point is ![x_1 = 242 \ km](https://tex.z-dn.net/?f=x_1%20%3D%20%20242%20%5C%20%20km)
The second position of john from the finish point is ![x_2 = 147 \ km](https://tex.z-dn.net/?f=x_2%20%3D%20%20147%20%5C%20km)
The third position of john from the finish point is ![x_3 = 161 \ km](https://tex.z-dn.net/?f=x_3%20%3D%20%20161%20%5C%20%20km)
Generally the displacement from the 242 km marker is mathematically represented as
![\Delta x _{1 , 3} = x_1 - x_3](https://tex.z-dn.net/?f=%5CDelta%20x%20_%7B1%20%2C%203%7D%20%3D%20%20x_1%20-%20x_3)
Here we used
instead of
because
is further than
from the finish point
=> ![\Delta x _{1 , 3} = 81 \ km](https://tex.z-dn.net/?f=%5CDelta%20x%20_%7B1%20%2C%203%7D%20%3D%2081%20%5C%20km)
Generally the total distance traveled by John is mathematically evaluated as
=>
=>
Answer: 17cm.
Explanation:
The equation you're using is:
Δd = df - di
Which means the change in position is equal to the final position minus the starting position. In this case that works out to 20cm - 3cm = 17cm. We're only interested in how much the snail moved, not how long it took to move, so even though they give a time it actually doesn't matter for this question.
Velocity<span> is a</span>vector<span> quantity; it is direction-aware.</span>
The convection currents in the mantle caused the crust on top to break apart & go different directions.