Answer:
<em>The ball has 7.35 joules of energy at position B.</em>
<em>The velocity of the ball at position A is 3.13 meter/second</em>
Explanation:
<u>Kinetic and Gravitational Potential Energy</u>
Kinetic energy is the form of energy that an object or a particle has by reason of its motion. An object of mass m and speed v has kinetic energy calculated by:
Gravitational Potential Energy is the form of energy that an object has by reason of its height h relative to a certain reference. It can be calculated as follows:
Where g is the acceleration of gravity.
The figure shows a pendulum with a bob (ball) of mass m=1.5 Kg. When it's pulled to point B, it has a height of h= 0.5 m and set to rest.
The potential energy at that point is:
The ball has 7.35 joules of energy at position B.
When the ball is released, all of the potential energy is transformed into kinetic energy when reaches point A. Thus:
K=7.35 J
From the equation of kinetic energy, we solve for v:
v = 3.13 m/s
The velocity of the ball at position A is 3.13 meter/second
Answer:
it is maybe A but i'm not 100% sure
Explanation:
its the only one that is mixed
The kinetic energy of an object is directly proportional to its mass, and to the square of its velocity.
The answer is C sorry if it’s wrong
Answer:
Acceleration,
Explanation:
Initial velocity of a particle in vector form, u = (-5i - 2j) m/s
Final velocity of particle in vector form, v = (-6i + 7j) m/s
Time taken, t = 8 seconds
We need to find the magnitude of acceleration vector. The changing of velocity w.r.t time is called acceleration of a particle. It is given by :
or
Hence, the value of acceleration vector is solved.