A plane mirror is vertical and moves normally to the right with velocity î m/s. At an instant it coincides with the y-axis. An object in front of it has velocity 2î+3ĵ m/s. What is the image velocity?
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Question

A plane mirror is vertical and moves normally to the right with velocity î m/s. At an instant it coincides with the y-axis. An object in front of it has velocity 2î+3ĵ m/s. What is the image velocity?

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G1 Physics · Accepted Answer

For the normal x-component, vᵢₓ=2vₘ−vₒₓ=2(1)−2=0. The parallel y-component is unchanged at 3 m/s. Thus vᵢ=3ĵ m/s.