Answer:
that's called Doppler effect
Explanation:
its observed because the distance between the source of sound and the observer is changing. If the source and the observer are approaching, then the distance is decreasing and if the source and the observer are receding.
-Hops
Answer:
The mass of the hailstone is 
Explanation:
From the question we are told that
The mass of the hockey puck is 
The initial speed of the puck is 
The final speed of the puck is 
According to the principles of linear momentum
At initial the velocity of the hailstone was zero so
So
substituting values
=> 
=> 
=>
Answer: C. The tendency of an object to maintain its state of motion.
Explanation: Newton’s first law: If a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
<h2>Greetings!</h2>
To find speed with distance and time, you need to remember the speed formula:
Speed = distance ÷ time
So we need speed and we have the other two values, we can plug the values in:
Speed = 20 ÷ 2 = 10
The measurement for speed in this case is m/s (metres per second)
<h3>So the answer is 10m/s</h3>
<h2>Hope this helps!</h2>
