Question

can anyone answer this

Answer 1

Answer:

I think it's b

Explanation:

because I have subteracted this by this and got this, then I added this with this and I got this b as the answer

Answer 2

Answer:

a) 150 J

Explanation:

apply conservation of energy

initial total energy=final total energy

=>(1/2)Kx^2=(1/2)Kx'^2+KE

=>KE=(1/2)k(x^2-x'^2)

sub values

(1/2)*4*10^4*(100-25)*10^-4

=>KE=75*2=150J