I think the answer is C. I am not be right
A) 18.4 m
B)
a) mass of the load
b) mass of the truck
Explanation:
A)
In order for the oad not to slide, its acceleration must be the same as the acceleration of the truck.
Since there is only one force acting on the load (the force of static friction), the acceleration of the load will be equal to the force of friction divided by the mass of the load (Newton's second law of motion):
(1)
where
m is the mass of the load
is the coefficient of static friction
is the acceleration due to gravity
The acceleration of the truck (and the load) is also related to the stopping distance of the truck by the suvat equation:
(2)
where
v = 0 is the final velocity of the car
u = 12.0 m/s is the initial velocity
a is the acceleration
s is the stopping distance
Since the acceleration must be the same, we can substitute (1) into (2), and solving for s we find:

B)
From part A, we see that the data that we have not used in the calculation are:
- The mass of the load
- The mass of the truck
Therefore, the two pieces of data unnecessary for the solution are
a) mass of the load
b) mass of the truck
Question in proper order
The rotational kinetic energy term is often called the <em>kinetic energy </em><em>in</em> the center of mass, while the translational kinetic energy term is called the <em>kinetic energy </em><em>of</em> the center of mass.
You found that the total kinetic energy is the sum of the kinetic energy in the center of mass plus the kinetic energy of the center of mass. A similar decomposition exists for angular and linear momentum. There are also related decompositions that work for systems of masses, not just rigid bodies like a dumbbell.
It is important to understand the applicability of the formula

Which of the following conditions are necessary for the formula to be valid?
a. The velocity vector
must be perpendicular to the axis of rotation
b.The velocity vector
must be perpendicular or parallel to the axis of rotation
c. The moment of inertial must be taken about an axis through the center of mass
Answer:
Option c
Explanation:

The first two conditions are untrue, this is because, you can have rotation in any direction and translation in any direction of any collection of masses. Rotational and translational velocities of masses do not depend on each other
The last statement is true because by definition, the moment of inertia, which is a measure of reluctance, is usually taken about a reference point which is the center of mass
Answer:
The different types of energy include thermal energy, radiant energy, chemical energy, nuclear energy, electrical energy, motion energy, sound energy, elastic energy and gravitational energy.
Speed ignores the direction of motion and is a scalar quantity. Velocity requires a directional component (like the arrow in a vector). In circular motion, the speed remains the same but the velocity is constantly changing since the direction of motion is constantly changing (ie. it is accelerating).