They are called fixed and movable pulleys
Answer:

Explanation:
Given that,
Width of a one dimensional potential box, 
The energy of a particle in one dimensional box is given by :

h = Planck's constant
m = the mass of the proton
For minimum kinetic energy, n = 1


So, the minimum kinetic energy of the neutron is
. Hence, this is the required solution.
If the impulse is 25 N-s, then so is the change in momentum.
The mass of the ball is extra, unneeded information.
Just to make sure, we can check out the units:
<u>Momentum</u> = (mass) x (speed) = <u>kg-meter / sec</u>
<u>Impulse</u> = (force) x (time) = (kg-meter / sec²) x (sec) = <u>kg-meter / sec</u>
Answer:

Explanation:
From Newton's 2nd Law, we have
. Using this, we can find the acceleration of the object:
.
Now that we've found the block's acceleration, we can use the following kinematics equation to find its final velocity after 2 seconds:

*Assumption: The block is initially at rest and has a initial velocity of zero. Otherwise, the question is unsolvable.