Answer:
Negative
Explanation:
Observe that the object below moves in the positive direction with a changing velocity. An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration).
answer C is the correct one
Answer:
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Explanation:
Answer:
The force required to move the quarterback with linebacker is <u>1215 N</u>
Explanation:
![\text { Mass of linebacker } \mathrm{m}_{2}=150 \mathrm{kg}](https://tex.z-dn.net/?f=%5Ctext%20%7B%20Mass%20of%20linebacker%20%7D%20%5Cmathrm%7Bm%7D_%7B2%7D%3D150%20%5Cmathrm%7Bkg%7D)
![\text { Mass of quarterback } \mathrm{m}_{2}=120 \mathrm{kg}](https://tex.z-dn.net/?f=%5Ctext%20%7B%20Mass%20of%20quarterback%20%7D%20%5Cmathrm%7Bm%7D_%7B2%7D%3D120%20%5Cmathrm%7Bkg%7D)
![\text { Moved at an acceleration }(a)=4.5 \mathrm{m} / \mathrm{s}^{2}](https://tex.z-dn.net/?f=%5Ctext%20%7B%20Moved%20at%20an%20acceleration%20%7D%28a%29%3D4.5%20%5Cmathrm%7Bm%7D%20%2F%20%5Cmathrm%7Bs%7D%5E%7B2%7D)
Using Newton's second law, it is established that F = Ma
Where F is net force acting on the system, a is the acceleration and M is mass of the two object ![\left(m_{1}+m_{2}\right)](https://tex.z-dn.net/?f=%5Cleft%28m_%7B1%7D%2Bm_%7B2%7D%5Cright%29)
Now consider both
as a system, so net force acting on the system is ![\text { Force }=\left(m_{1}+m_{2}\right) a](https://tex.z-dn.net/?f=%5Ctext%20%7B%20Force%20%7D%3D%5Cleft%28m_%7B1%7D%2Bm_%7B2%7D%5Cright%29%20a)
Substitute the given values in the above formula,
![\text { Force }=(150+120) \mathrm{kg} \times 4.5 \mathrm{m} / \mathrm{s}^{2}](https://tex.z-dn.net/?f=%5Ctext%20%7B%20Force%20%7D%3D%28150%2B120%29%20%5Cmathrm%7Bkg%7D%20%5Ctimes%204.5%20%5Cmathrm%7Bm%7D%20%2F%20%5Cmathrm%7Bs%7D%5E%7B2%7D)
![\text { Force }=270 \mathrm{kg} \times 4.5 \mathrm{m} / \mathrm{s}^{2}](https://tex.z-dn.net/?f=%5Ctext%20%7B%20Force%20%7D%3D270%20%5Cmathrm%7Bkg%7D%20%5Ctimes%204.5%20%5Cmathrm%7Bm%7D%20%2F%20%5Cmathrm%7Bs%7D%5E%7B2%7D)
Force = 1215 N
<u>1215 N </u>is the force required to move the quarterback with linebacker.
When an object's atoms move faster, its thermal energy increases and the object becomes warmer.