It's moving, in a straight line and at a constant speed. It can't be accelerating.
Compared to the emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a<u> higher frequency.</u>
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<h3>What is the frequency?</h3>
Frequency is defined as the number of repetitions of a wave occurring waves in 1 second. Its unit is Hz. Frequency is given by the formula as,
A moving car is targeted by radio waves sent from a radar gun by a police officer standing still.
The radio waves reflected off the vehicle and picked up by the radar gun have a greater frequency than the radio waves that were transmitted.
A stationary police officer directs radio waves emitted by a radar gun at a vehicle moving toward the officer.
Compared to the emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a<u> higher frequency.</u>
Hence the higher frequency is the correct answer for blanks.
To learn more about the frequency refer;
brainly.com/question/14926605
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#SPJ1
-- The kinetic energy it has when it hits the ground is exactly
the potential energy it had just before you dropped it.
-- So if you want it to have twice as much kinetic energy at the bottom,
you want it to have twice as much potential energy at the top.
-- Potential energy = (mass)·(gravity)·(height).
The only one of those things that you can change is the height.
Looking at that equation, you can see that if you change the height,
the potential energy changes by the same factor.
So if you want the pebble to have twice as much potential energy,
you have to drop it from twice the original height. (2h)
The answer is b. because they move freely