Question

Question #a2be2

Answer 1

C

Explanation:

At mean position all the potential energy has been converted in to bob's kinetic energy. Setting up the equation we get

`PE=KE`

Using formulae for both
`mgDeltah=1/2mv^2`
`=>v^2=2gDeltah`
`=>v=sqrt(2gDeltah)`

Inserting given values we get
`v=sqrt(2xx10xx0.1)`
`=>v=sqrt2" ms"^-1`