Answer:
W = 12.96 J
Explanation:
The force acting in the direction of motion of the sand paper is the frictional force. So, we first calculate the frictional force:
F = μR
where,
F = Friction Force = ?
μ = 0.92
R = Normal Force = 2.6 N
Therefore,
F = (0.92)(2.6 N)
F = 2.4 N
Now, the displacement is given as:
d = (0.12 m)(45)
d = 5.4 m
So, the work done will be:
W = F d
W = (2.4 N)(5.4 m)
<u>W = 12.96 J</u>
Increase your heart rate ! I hope this helps
Answer:
v = 29.73[m/s]
Explanation:
Kinetic energy is defined by the following equation:
![E_{k}=\frac{1}{2}*m*v^2 \\199=0.5*0.45}*v^2\\v=\sqrt{\frac{199}{0.5*0.45} }\\ v= 29.73[m/s]](https://tex.z-dn.net/?f=E_%7Bk%7D%3D%5Cfrac%7B1%7D%7B2%7D%2Am%2Av%5E2%20%5C%5C199%3D0.5%2A0.45%7D%2Av%5E2%5C%5Cv%3D%5Csqrt%7B%5Cfrac%7B199%7D%7B0.5%2A0.45%7D%20%7D%5C%5C%20v%3D%2029.73%5Bm%2Fs%5D)