what is law of conservation of mechanical energy?

Answer 1

if you have two particules which collides without chemical transformations The law states that the sum of the energies of the particles remain constant after the collision.In Maths, write

m1*v1^2 + m2 v2^2 = m1 V1^2 +m2 V2^2

where v are speeds before collision and V are speed after collisIon

There is also conservation of momentum

m1*v1 + m2 v2 = m1 V1 +m2 V2

Answer 2

This is because as long as you use the same reference point through your calculations/observations, you will see that energy is still conserved (i.e. its all relative). Changing the reference point does not change the actual energy in the system. Imagine a book on a table that falls to the ground. If I take the ground to be my reference point, the book had a positive gravitational potential energy, which was then converted into sound and heat when the book hit the floor as the gravitational potential energy decreased to 0. So gravitational potential energy was converted into heat and sound energy, and energy is conserved. If I take infinity to be the reference point, even though the book has a negative gravitational potential energy with respect to the reference, when the book falls, its gravitational energy becomes even more negative, and this energy is still converted into heat and sound. Energy is still conserved. The only thing that changed was your reference!

Answer 3

energy can neither be created nor be destroyed if energy disappear in one form it will reappear in another form without any loss

Answer 4

its the balance in kinetic and potential energy.. if u know few corelations betweeen these then u'll get it... input = output