Answer #4, because they wanted to show that they are the best
Answer:
Velocity will be equal to 7.31 m/sec
Explanation:
We have given mass of the student m = 61 kg
Height of the water slide h = 12.3 m
Acceleration due to gravity 
Potential energy is equal to 
Work done due to friction = -5800 J
So energy remained = 7352.94-5800 = 1552.94 J
This energy will be equal to kinetic energy
So 
v = 7.13 m/sec
I assume you mean that the car's motor is not running ... the car is just
sitting there.
If that's so, then the car's mechanical energy is just like the mechanical
energy of any other object. It has potential energy if it's in a high place
from which it can roll or fall, and it has kinetic energy if it's moving.
-- If you make the car move by pushing it, then you gave it kinetic energy
that it didn't have while it was just sitting there.
-- If it's already moving slowly, and you're able to make it move faster by
pushing, then you increased its kinetic energy.
-- If you're able to push it up a hill, no matter how small the hill is but just
to any higher place, then you gave it more gravitational potential energy
than it had before you came along.
In all of these cases, if you exert a force and keep exerting it through some
distance while the car moves, then you have done "work", which is just
another name for mechanical energy, and your work adds to the mechanical
energy of the car.
But if you didn't move the car, then no matter how hard you pushed, no work
was done, and the car's mechanical energy didn't change.
The answer would be:
C. An unbalanced force has acted on the vehicle.
The presence of an unbalanced force will accelerate an object, the second law of motion dictates this (Although not explicitly). Lets knock out the rest of the choices.
If a balance force acted on the vehicle, then the vehicle would be at rest. The mass of the vehicle did not change (Unless it falls apart, which I doubt). The direction of the vehicle does not change and it will only do so if another force and a stronger one at that will counteract the current net force acting on the vehicle.
Hope you got your answer here, although you did not ask for an explanation, maybe this will help you figure some of the other questions you have on your own.
The magnitude of the resulting acceleration of the block is 6.14 m/s².
The given parameters;
- <em>mass of the block, m = 2.2 kg</em>
- <em>horizontal force on the block, F = 27 N</em>
- <em>force below the horizontal, 81 N at 60⁰</em>
The net horizontal force on the block is calculated as follows;
The acceleration of the block is calculated as follows;
Thus, the magnitude of the resulting acceleration of the block is 6.14 m/s².
Learn more here:brainly.com/question/13707159
