If `alpha` is angular acceleration , `omega` is angular velocity and a is the centripetal acceleration then ,which of the following is true ?

Options

A. `alpha =(omegaa)/(v)`
B. `alpha =(v)/(omegaa)`
C. `alpha =(av)/(omega)`
D. `alpha =(a)/(omegav)`

Answer

A

Explanation

Centripetal acceleration , `1/2mv^2=E^2=1/2mr(v^2)/(r)=E`
`1/2mra=ErArra =(2E)/(mr)`