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www.dummies.com/education/science/physics/conserving-kinetic-energy

That means using the conservation of kinetic energy. The collision was an elastic one, so kinetic energy was indeed conserved. That means that. With two equations and two unknowns, v f1 and v f2, you can solve for those unknowns in terms of the masses and v o1.

study.com/academy/lesson/conservation-of-kinetic-energy.html

Kinetic energy is the energy of motion. In this lesson we will investigate how kinetic energy is sometimes conserved and sometimes not conserved based on the type of collisions between masses.

physics.stackexchange.com/questions/151489/how-can-kinetic-energy-be-conserved...

How can kinetic energy be conserved in an elastic collision as collision is said to occur between two bodies if they physically collide against each other or if the path of one of then is affected by the force exerted by the other? If they collide, path of the object will change so velocity should change as velocity is a vector quantity.

hyperphysics.phy-astr.gsu.edu/hbase/elacol.html

Any macroscopic collision between objects will convert some of the kinetic energy into internal energy and other forms of energy, so no large scale impacts are perfectly elastic. Momentum is conserved in inelastic collisions, but one cannot track the kinetic energy through the collision since some of it is converted to other forms of energy.

en.wikipedia.org/wiki/Conservation_of_energy

Classically, conservation of energy was distinct from conservation of mass; however, special relativity showed that mass is related to energy and vice versa by E = mc 2, and science now takes the view that mass–energy is conserved. Conservation of energy can be rigorously proven by Noether's theorem as a consequence of continuous time ...

www.quora.com/When-is-momentum-conserved-and-when-is-kinetic-energy-conserved

I will upvote Arpit's excellent answer, but add a simpler (but slightly less correct, and slightly less complete) in the hope that it helps the OP understand the rules. 1. Momentum is always conserved 2. Energy is always conserved 3. Kinetic e...

www.physicsforums.com/threads/why-rotational-kinetic-energy-of-a-closed-system...

A simple rotating system with no external forces acting on it carries a fixed angular momentum and an associated rotational kinetic energy. If the system changes its internal configuration, such as a spinning skater retracting or extending his/her arms, the angular momentum remains constant since no external torque is applied on the system.

en.wikipedia.org/wiki/Kinetic_energy

Kinetic energy is the movement energy of an object. Kinetic energy can be transferred between objects and transformed into other kinds of energy. Kinetic energy may be best understood by examples that demonstrate how it is transformed to and from other forms of energy.

answers.yahoo.com/question/index?qid=20100708082139AAbDRqc

When is momentum conserved, and when is kinetic energy conserved? So far it seems like momentum is conserved when there is no friction. Is kinetic energy also conserved when there is no friction? What's the rule about head-on collisions/inelastic vs elastic collisions?

www.bu.edu/gk12/kai/Lesson 4/E_Back.pdf

sun, its potential energy is high and its kinetic energy low, reduced speed keeping pace with gravitational force. Drop a ball: Since the ball is in free-fall, the only force acting on it is gravity. Therefore, we can use the principle of conservation of mechanical energy - initially the ball has potential energy and no kinetic energy.