Force is given by the expression F = A cos (Bx) + C cos (Dt), where x is displacement and t is time. The dimension of `(D)/(R )` is same as that of

Answer

A

Explanation

`Dt=Bx`
`rArr Bx=Dt`
`rArr (B)/(D)=(t)/(x)`
`rArr (D)/(B)=(x)/(t)`
`=(L)/(T)`
`LT^(-1)`
= velocity .