Question

prove law of conservation of energy​

Answer 1

Answer:

according to law of conservation of energy,it is neither created nor destroyed but can be changed from one form to other.

Answer 2

Explanation:

law of conservation of energy:

energy can neither get created nor destroy. it can be change from one form to another form.

in case 1,

P. E. =mgh

K. E= joule

M.E. = K. E. +P. E = mgh

in case 2,

K. E. =1/2mv^2..................... (1)

by newton third equation of motion,

v^2=u^2+2gh

but, u=0m/s

thus, v^2=2gh.....................(2)

by putting the value of (2) in (1),

K. E. =1/2×m×(2gh)

=mgh

P. E =0 joule

M. E. = K. E +P. E = mgh

similarly, we can prove for the third case also.

hence at every point the energy will conserve.