Calculate the avg speed phyics help

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To calculate the average speed of the caiman, the total distance of 530 meters is divided by the total time taken. The caiman swims 190 meters at 6 m/s, taking 31.67 seconds, and then swims 340 meters at 4 m/s, taking 85 seconds. Adding these times results in a total of 116.67 seconds. The average speed is then calculated as 530 meters divided by 116.67 seconds, which yields approximately 4.54 m/s. The calculation was confirmed to be correct by participants in the discussion.
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"Calculate the avg speed" phyics help

Homework Statement



A caiman swims 190 meters at a speed of 6 m/s. It then enters a stream and slows to 4 m/s for 340 meters. What is the average speed of the crocodile?
10 minutes ago - 4 days left to answer.


Homework Equations





The Attempt at a Solution

 
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deaninator said:

Homework Statement



A caiman swims 190 meters at a speed of 6 m/s. It then enters a stream and slows to 4 m/s for 340 meters. What is the average speed of the crocodile?
10 minutes ago - 4 days left to answer.


Homework Equations





The Attempt at a Solution


You have two distance and speed sets from which you can get times. Add the times and add the distances, now you have a new r = D/t.
 


AC130Nav said:
You have two distance and speed sets from which you can get times. Add the times and add the distances, now you have a new r = D/t.

I did that. I added 190m and 340m and I got 530m as the total distance. I did the v=d/t formula on both distances and i got the times as 85 s and 31.66 s. I then divided 530m.116.66 s and i got 4.54 m/s but that is incorrect.
 


deaninator said:
I did that. I added 190m and 340m and I got 530m as the total distance. I did the v=d/t formula on both distances and i got the times as 85 s and 31.66 s. I then divided 530m.116.66 s and i got 4.54 m/s but that is incorrect.

Your numbers appear correct.
 


Thanks, you were right all along!
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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