An observer is looking at an image of an object in a flat mirror. If the observer is 1m behind the object, and the object is 2m away from the mirror.
If the ray intersecting with the mirror is 1m, in height from the ground.
1. What is the length of the object? Show all your work.

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?