When the ball bounces up it has kinetic energy.But before it falls it has potential energy, and then as it falls has kinetic energy again. The ones used the most is kinetic.
Answer:
Speed, v = 5 m/s
Explanation:
We have,
The length of the football field, l = 100 m
A person takes 20 seconds to run its length.
It is required to find the speed of the person with which he should run. The distance covered divided by time taken is called its velocity.
![v=\dfrac{d}{t}\\\\v=\dfrac{100\ m}{20\ s}\\\\v=5\ m/s](https://tex.z-dn.net/?f=v%3D%5Cdfrac%7Bd%7D%7Bt%7D%5C%5C%5C%5Cv%3D%5Cdfrac%7B100%5C%20m%7D%7B20%5C%20s%7D%5C%5C%5C%5Cv%3D5%5C%20m%2Fs)
So, the speed of the person is 5 m/s.
Answer:The kinetic energy will decrease.
Explanation:As potential energy increases kinetic energy will increase, as kinetic or potential energy decreases, the kinetic or potential energy will decrease
<u><em>Correct question:</em></u><u><em>a </em></u><u><em>200 g </em></u><u><em>ball is dropped from a height of 2m, bounces on a hard floor and rebounds to a height of 1.5m. What maximum force does the floor exert on the ball?</em></u>
<u><em>The diagram of the question is in the attachment.</em></u>
Answer:
Explanation:
V=√2gh
g-10m/s²
let u be initial velocity ad v be final velocity,
u=√2*10*2
u=6.324m/s
v=√2*10*1.5
v=5.477m/s
from the diagram
t=5ms=0.005s
![F=\frac{m(v-u)}{t}](https://tex.z-dn.net/?f=F%3D%5Cfrac%7Bm%28v-u%29%7D%7Bt%7D)
![F=\frac{0.2(5.477-6.324)}{0.005}](https://tex.z-dn.net/?f=F%3D%5Cfrac%7B0.2%285.477-6.324%29%7D%7B0.005%7D)
F=-33.87N (the negative shows direction)
From the diagram Fmax=2F
Fmax= 2*33.87
=67.74N