A car travels due north at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the Earth, what is the speed of the rain with respect to the Earth?

The speed of the rain is  

Explanation:

From the question we are told that

  The initial speed and direction of the car is  

    The angle made with the horizontal is  

    The velocity of rain is  

An  illustrate  of this question is shown on the first uploaded image

    From the diagram we see that

=>              

substituting values

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.

3. dark matter

empty space could also be a simple vacuum