A block of mass n is pulled in the direction shown in the figure on a rough horizontal ground with a constant acceleration of megnitude 'a'. The megnitude of the friction force is-

Options

A. `T cos theta - ma`
B. `mu_k mg`
C. `mu_k (T - mg)`
D. `mu_k T sin theta`

Answer

A

Explanation

`T cos theta-f= ma" "implies" "f=T cos theta-ma`