Answer:
Explanation:
Given a school bus.
Let say initially the school bus is traveling with speed "v"
Let assume mass of school bus is "m"
Then, the initial kinetic energy is
K.E_initial = ½mv²
Now, if the initial velocity is tripled,
Then, the new velocity is
v_new = 3v.
Note: the mass of the school does not change it is constant
Then, new kinetic energy is
K.E_new = ½m(v_new)²
v_new = 3v
Then,
K.E_new = ½m(3v)²
K.E_new = ½m × 9v²
K.E_new = 9 × ½mv²
Since K.E = ½mv²
Then,
K.E_new = 9 × K.E
So, the new kinetic energy will be 9 times the initial kinetic energy.
So, option D is correct
D. It will be nine times greater.
Answer:
W = 157.5kJ
Explanation:
Assuming it moves the container at constant speed, the work done by the crane will be equal to the variation of the potential gratitational energy on the container:
where h2= -8m and h1=0m
Wc = 157.5kJ
You might want to do a re-erp on this equation
This is possible due to inertia of motion. which is nothing but newton's first law.
according to this law , an object tries to retain its state of motion or rest unless acted upon by an external force.
consider an object placed on a paper, initially both the object and paper are at rest. to pull the paper , we apply force on the paper and paper gains velocity. but the object keeps its motion of rest and hence the paper can be removed without moving the object.
The forces acting on a ball just after it's released from the thrower's hand is <u>gravity</u>.
<h3>What is a force?</h3>
A force refers to a push or pull of an object such as a ball, which typically results in a change of motion (acceleration), especially due to the interaction of the object with another.
<h3>What is gravity?</h3>
Gravity can be defined as a force of attraction that controls the movement of an object such as a ball and the planets around the Sun.
In this scenario, the forces acting on a ball just after it's released from the thrower's hand is a force of <u>gravity</u> or gravitational force since it was thrown horizontally.
Read more on force here: brainly.com/question/1121817
