20N•m or 20J. Work is equal to force•distance, and 5N•4m is 20N•m, or J
Answer:
a.After
second Mr Comer's speed
![1.7 m/s](https://tex.z-dn.net/?f=1.7%20m%2Fs)
b.Distance travelled by Mr.Comer in
seconds
![18.75\ m](https://tex.z-dn.net/?f=18.75%5C%20m)
Explanation:
a. Lets recall our first equation of motion ![V_{f} =V_{i} + at](https://tex.z-dn.net/?f=V_%7Bf%7D%20%3DV_%7Bi%7D%20%2B%20at)
Now we know that
,
and
![t = 15 \ sec](https://tex.z-dn.net/?f=t%20%3D%2015%20%5C%20sec)
Plugging the values we have.
![V_{f} =V_{i} + at](https://tex.z-dn.net/?f=V_%7Bf%7D%20%3DV_%7Bi%7D%20%2B%20at)
![V_{f} =0.8 + 0.06 \times 15](https://tex.z-dn.net/?f=V_%7Bf%7D%20%3D0.8%20%2B%200.06%20%5Ctimes%2015)
![V_{f} =0.8+ 0.9](https://tex.z-dn.net/?f=V_%7Bf%7D%20%3D0.8%2B%200.9)
![V_{f} =1.7 m/s](https://tex.z-dn.net/?f=V_%7Bf%7D%20%3D1.7%20m%2Fs)
Then Mr.Comer's speed after
sec
![1.7ms^-1](https://tex.z-dn.net/?f=1.7ms%5E-1)
b.
Lets find the distance and recall our third equation of motion.
![V_{f} ^2-V{i}^2 = 2as](https://tex.z-dn.net/?f=V_%7Bf%7D%20%5E2-V%7Bi%7D%5E2%20%3D%202as)
So
distance covered.
Dividing both sides with 2a we have.
![\frac{V_{f} ^2-V{i}^2}{2a} = 2as](https://tex.z-dn.net/?f=%5Cfrac%7BV_%7Bf%7D%20%5E2-V%7Bi%7D%5E2%7D%7B2a%7D%20%3D%202as)
Plugging the values.
![\frac{(1.7)^2-(0.8)^2}{2\times0.06} = 2as](https://tex.z-dn.net/?f=%5Cfrac%7B%281.7%29%5E2-%280.8%29%5E2%7D%7B2%5Ctimes0.06%7D%20%3D%202as)
![s= 18.75\ m](https://tex.z-dn.net/?f=s%3D%2018.75%5C%20m)
So Mr.Comer will travel a distance of
.
Answer:
![\boxed{ \bold{ \huge{ \boxed {\sf{8.33 \: m \:/s \: }}}}}](https://tex.z-dn.net/?f=%20%5Cboxed%7B%20%5Cbold%7B%20%5Chuge%7B%20%5Cboxed%20%7B%5Csf%7B8.33%20%5C%3A%20m%20%5C%3A%2Fs%20%5C%3A%20%7D%7D%7D%7D%7D%20)
Explanation:
Distance travelled = 200 metre
Time taken = 24 second
Velocity = ?
<u>Finding </u><u>the</u><u> </u><u>velocity</u><u> </u>
![\boxed{ \sf{velocity = \frac{distance \: travelled \: }{time \: taken}}}](https://tex.z-dn.net/?f=%20%5Cboxed%7B%20%5Csf%7Bvelocity%20%3D%20%20%5Cfrac%7Bdistance%20%5C%3A%20travelled%20%5C%3A%20%7D%7Btime%20%5C%3A%20taken%7D%7D%7D%20)
![\dashrightarrow{ \sf{velocity = \frac{200 \: m}{24 \: s} }}](https://tex.z-dn.net/?f=%20%5Cdashrightarrow%7B%20%5Csf%7Bvelocity%20%3D%20%20%5Cfrac%7B200%20%5C%3A%20m%7D%7B24%20%5C%3A%20s%7D%20%7D%7D)
![\dashrightarrow{ \sf{velocity = 8.33 \: m/s}}](https://tex.z-dn.net/?f=%20%5Cdashrightarrow%7B%20%5Csf%7Bvelocity%20%3D%208.33%20%5C%3A%20m%2Fs%7D%7D)
Hope I helped!
Best regards!
D. According to the hierarchy of needs the body and mind must be taken care of first and foremost.