Explanation:
Given that,
The slope of the ramp, 
Mass of the box, m = 60 kg
(a) Distance covered by the truck up the slope, d = 300 m
Initially the truck moves with a constant velocity. We know that the net work done on the box is equal to 0 as per work energy theorem as :

u and v are the initial and the final velocity of the truck
(b) The work done on the box by the force of gravity is given by :

Here, 


W = -24550.13 J
(c) What is the work done on the box by the normal force is equal to 0 as the angle between the force and the displacement is 90 degrees.
(d) The work done by friction is given by :


Hence, this is the required solution.
The three phases of matter differ in properties just because of the proximity of their molecules. The solid phase is the most organized of all. Its atoms are compactly arranged together and has the strongest intermolecular forces to keep them together. This is why they have a definite shape and volume. The liquid phase have molecules that are far away from each other, but not as far as that of the gas phase. The liquid and gas phases can be lumped into one group called fluids because they have the same property - they take the shape and volume of their container.
To make an analogy, see the attached picture for your reference.
Answer:

Explanation:
The formula for density is:

where <em>m</em> is the mass and <em>v</em> is the volume.
The mass is 0.45 kilograms and the density is 13.6 grams per milliliter. The density is given in grams, so we must convert the mass.
There are 1000 grams in 1 kilogram or
. We can multiply the mass by this ratio.

Now we have values for the mass and density:

Cross multiply.


We are trying to find the volume, so we must isolate that variable.
13.6 and v are being multiplied. The inverse of multiplication is division. Divide both sides by 13.6


The grams will cancel.

The volume is about 33.088 milliliters.
Answer:
The speed is 3.87 m/s
Explanation:
The total work is equal to the change to kinetic energy:
Wtotal = ΔEk
Wspring + Wfriction = Ekf - Eki
Eki = 0

Where
k = 200 N/m
d = 10 cm = 0.1 m
fk = 0.15
m = 2 kg
g = 9.8 m/s²
vi = 4 m/s
Replacing and clearing v:
