The energy added here is potential energy since it is moving upward 180 meters in a gravitational field. This is then turned into KE when it rolls down. 2524N x 180m = 454,320J
I haven’t learned this in quite a while, but from what I remember it should be A! I could be wrong but hopefully this helps
Answer:
-10 m/s²
Explanation:
Average acceleration is change in velocity over change in time.
a = (v − v₀) / (t − t₀)
a = (0 m/s − 20 m/s) / (2 s − 0 s)
a = -10 m/s²
Answer:
Quark
Explanation:
In the past the proton,neutron and electron were believed to be indivisible. Quarks were later discovered to be particles that make up the proton and neutron. Quarks are known as fast moving points of energy and are usually joined to one another through gluons. Neutron has two down quarks and one up quark while proton has two up quarks and one down quark.
Answer:
0.51
Explanation:
m = Mass = 70 kg
g = Acceleration due to gravity = 9.81 m/s²
t = Time taken
u = Initial velocity = 80 km/h = 80/3.6 = 22.22 m/s
v = Final velocity
a = Acceleration
s = Displacement = 50 m
![v^2-u^2=2as\\\Rightarrow a=\frac{v^2-u^2}{2s}\\\Rightarrow a=\frac{0^2-22.22^2}{2\times 50}\\\Rightarrow a=-4.93\ m/s^2](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as%5C%5C%5CRightarrow%20a%3D%5Cfrac%7Bv%5E2-u%5E2%7D%7B2s%7D%5C%5C%5CRightarrow%20a%3D%5Cfrac%7B0%5E2-22.22%5E2%7D%7B2%5Ctimes%2050%7D%5C%5C%5CRightarrow%20a%3D-4.93%5C%20m%2Fs%5E2)
![F=ma\\\Rightarrow F=70\times 4.93\\\Rightarrow F=345.1](https://tex.z-dn.net/?f=F%3Dma%5C%5C%5CRightarrow%20F%3D70%5Ctimes%204.93%5C%5C%5CRightarrow%20F%3D345.1)
![F=\mu N\\\Rightarrow 345.1=\mu \times 70\times 9.81\\\Rightarrow \mu=\frac{345.1}{70\times 9.81}\\\Rightarrow \mu=0.51](https://tex.z-dn.net/?f=F%3D%5Cmu%20N%5C%5C%5CRightarrow%20345.1%3D%5Cmu%20%5Ctimes%2070%5Ctimes%209.81%5C%5C%5CRightarrow%20%5Cmu%3D%5Cfrac%7B345.1%7D%7B70%5Ctimes%209.81%7D%5C%5C%5CRightarrow%20%5Cmu%3D0.51)
Kinetic coefficient of friction between the road and the crate is 0.51