Alight source is made to pass through a narrow slit in a window .how do you think the light rays will travel

light will show the phenomenon of diffraction in which light rays get deviated from its path and reached into the region of darkness.

Explanation:

When light is passing through a small slit or narrow window then due to the corners of the small slit or window light gets diffracted and then it will deviated from its path

Due to deviation of light we will get alternative maximum and minimum intensity of light.

This phenomenon is known as diffraction of light

so light will travel in straight line again but it gets diverge in different directions which will show us maximum and minimum intensity on the screen alternatively due to superposition

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.