An elevator with a mass of 2,560 kg is pulled straight up by a cable such that it accelerates at 4.5 m/s 2 in the upward directi
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It’s solved by using a pretty standard formula for efficiency.
Force is defined as the rate of change of momentum.
The initial amount of momentum is
because water stops when it hit the wall total change of momentum must be 
.
Now let's calculate the force.
We need to find
. This is the amount of water hiting the wall per second.
Our final formula would be:
And now we can calculate the answer:
The initial amount of momentum is
Now let's calculate the force.
We need to find
Our final formula would be:
And now we can calculate the answer: