The velocity of image object and mirror both are moving towards each other with velocities `4ms^(-1) and 5ms^(-1)` respectively, is

Options

A. `- 14 ms^(-1)`
B. `15 ms^(-1)`
C. `-9 ms^(-1)`
D. `14 ms^(-1)`

Answer

A

Explanation

`V_(OM)` = velocity of object with respect to mirror
`= - V_(lM)`
(Here, `V_(lM)` = velocity of image with respect to mirror)
`rArr " " V_(O)-V_(M)=-(V_(l)-V_(M))`
`4ms^(-1)-(-5ms^(-1))=-V_(l)+(-5ms^(-1))`
`V_(l)=-14 ms^(-1)`