Answer:
Gravity is the force that allows for all objects to fall.
Answer:
speed = wavelength * frequency
Explanation:
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The formula for final velocity is Speed= distance/time (s=d/t)
Velocity is another word for speed.
Explanation:
When a bullet is fired from a rifle, the actual firing makes a distinctive sound, but people at a distance may hear a second because the bullet creates a shock wave , a little sonic boom( speed of this sonic boom is greater than the speed of sound). It is this sound only that is heard by the people at a distance from the gun.