Which of the following describes how the mechanical advantage of a simple machine affects the amount of force needed for work? A. By decreasing the distance over which the input force is applied, less force is needed to do the same amount of work. B. By increasing the distance over which the input force is applied, more force is needed to do the same amount of work. C. By decreasing the distance over which the input force is applied, more force is needed to do the same amount of work. D. By increasing the distance over which the input force is applied, less force is needed to do the same amount of work.

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Ответ:

googoo4

18.11.2022

Physics

6.86 m/s

Explanation:

$s=\text{Height the salmon jumps}=2.4\ \text{m}$

$a=g=\text{Acceleration due to gravity}=9.81\ \text{m/s}^2$

$v=\text{Final velocity}=0$

$u=\text{Initial velocity}$

From the equations of motion we have

$v^2-u^2=2as\\\Rightarrow u=\sqrt{v^2-2as}\\\Rightarrow u=\sqrt{0^2-2\times -9.81\times 2.4}\\\Rightarrow u=6.86\ \text{m/s}$

The minimum speed required for the salmon to reach the height of 2.4 m is 6.86 m/s assuming the salmon is going straight up.

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