New here PLZ HLP ME OUT!!!!!!!!

[duffer geek]

can u tel me hw 2 solve n07 q 20
J02 q 28

and tel me hw to prepare the following topics
deformation of solids
waves - diffraction

 

[Babuzar]

can u tel me hw 2 solve n07 q 20
J02 q 28

and tel me hw to prepare the following topics
deformation of solids
waves - diffraction

The answer is A, 2.5J. 1/2 kx2......where k is the gradient. so 0.20/25 = 0.008(this is the spring constant). Then just put it in the equation. 1/2x(0.008)x25x25=2.5J

let me see the other question

 

[duffer geek]

THAnKS !!!!!!!!!!!!!!!! u wr mere help than our physics teacher!