The crate would slide forward
Sound waves.
Eathquake P-Waves
I assume L=120 yards as the length of the football field.
1) The average speed is given by the total distance covered by the player divided by the time taken.
The total distance covered to go from one goal line to the other and then back to the 40-yards line is

And the time taken is t=22.4 s, so the average speed of the player is

2) The find the average velocity, we should also consider the direction (and the sign) of the velocity.
In the the first part of the motion, the player goes from one goal line to the other one, so he covers 120 y. However, in the second part of the motion he goes back by 80 y. Therefore, the net displacement of the player is

and so, the average velocity is
<span>Answer: Doppler radar
Doppler radar or weather radar is used to locate precipitation,</span> forecast future intensity, calculate
or detecting its motion and estimates precipitation whether it is a rain, snow,
hail or storm. They are also helpful in determining the structure of storms and
its potential to cause severe weather.
Moreover, if a portion of the atmosphere becomes
saturated with water vapor, it will condense and precipitate allowing Doppler
radar to analyze and observe precipitation.
Answer:
The impulse is -20kg m/s.
Explanation:
given mass of ball = 0.4 kg
The ball is moving towards left with the initial velocity = 30m/s
The momentum in left direction P1 = mv1
= (0.4)(30)
= 12 kg m/s
The given velocity towards right = -20 m/s ( negative sign shows inverse direction)
Momentum towards right, P2 = mv2
P2 = (0.4)(-20)
P2 = -8 kg m/s
The Impulse = change in momentum
= P2 –P1
= -8-12
= -20 kg m/s