A point object O and a mirror M move wit...

A point object O and a mirror M move with velocities of `3 cm s^(-1)` and `4 cm s^(-1)` , respectively as shown in the figure. OO' is the normal to the mirror. What is the velocity of the image?

`5 cm s^(-1)`

`7 cm s^(-1)`

`8 cm s^(-1)`

`2sqrt(19) cm s^(-1)`

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