Answer:
32.46m/s
Explanation:
Hello,
To solve this exercise we must be clear that the ball moves with constant acceleration with the value of gravity = 9.81m / S ^ 2
A body that moves with constant acceleration means that it moves in "a uniformly accelerated motion", which means that if the velocity is plotted with respect to time we will find a line and its slope will be the value of the acceleration, it determines how much it changes the speed with respect to time.
When performing a mathematical demonstration, it is found that the equations that define this movement are the follow

Where
Vf = final speed
Vo = Initial speed
=7.3m/S
A = g=acceleration
=9.81m/s^2
X = displacement
=51m}
solving for Vf

the speed with the ball hits the ground is 32.46m/s
B. longitudinal wave
Explanation:
Longitudinal waves are made up of regions of rarefaction and compression. They are waves that are propagated parallel to their source.
- During wave compression, molecules are pressed together and are closer to each other.
- Rarefaction is where molecules are farther apart and are distant.
- In longitudinal waves, the source is parallel to the wave propagation.
- Transverse waves are perpendicular to their source.
- Electromagnetic consists of vibrations in both perpendicular direction.
- Surface waves are seismic waves that are made up of both transverse and longitudinal components.
Learn more:
Electromagnetic waves brainly.com/question/12450147
#learnwithBrainly
The first choice is the answer.
Answer:
720 J
Explanation:
Kinetic Energy = 1/2 * m *(v*v)
M= 90 kg
V=4 m/s
KE=1/2 * 90 * (4*4)
KE= 45*16= 720 J