What's the effect of mass and speed on kinetic energy

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

What happens to the light rays when they hit the specimen?

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?