- #1

- 20

- 1

## Homework Statement

A sphere of 4kg falls from a height of 70cm and lands on a spring of constant 2 *10² N/m.

Whats the max velocity the sphere reachs?

g=10m/s²

## Homework Equations

Ep=m*G*h

Ek=mv²/2

Eel=k*x²/2

Vmax=sqrt(2g*h) (internet source idk if this is right)

## The Attempt at a Solution

I tried this Ep = Eel + epx

Ep=4*0,7*10

28=kx²/2 + mg*x

x=0,367 m

them i did 0,7 + 0,367 for the height

and it gave me Sqrt(2g*h)=v

V=4,62 m/s

not the answer, i couldnt get my head around the energies. I also tried Ep=Eel but no sucess