Answer:
A car accelerates uniformly from 5m/s to 10m/s in 5s ...
A car starts from rest and picks up a velocity of 20 m/s ...
A car accelerates uniformly from 10m/s to 20m/s in 5 ...
How much work is required to accelerate a 1000 kg car ...
More results from<u> www.quora.com</u>
Explanation:
Hydro power, although a low-cost option, is not implemented every time because of the amount of disadvantages there are. One of the disadvantages this has is the pollution is gives. Since the reservoir is always filled with water, this causes any surrounding plants and trees to decompose, releasing a huge amount of methane and carbon dioxide into the environment. Aside from this, it also destroys nearby habitats, and diverts natural waterways, effectively killing fishes too.
For a point charge, The potential varies inversely with distance from the point charge r, that is Potential V ∝ 
A point charge is defined as a charge that neither has mass nor volume, that is it exists as a single point.
The point charge with respect to the electric potential should be expressed in
V = KQ/r
Here we can say that the electric potential should be varied oppositely to the distance
Electric potential is defined as the amount of work needed to bring a charge from infinity to a certain place in opposition to electrostatic force. Only when there is a potential gradient at the conductor's ends do electrons travel across it.
Refer to more about potential here
brainly.com/question/17058027
#SPJ4
The minimum frequency to extract an electron is D) 
Explanation:
The equation for the photoelectric effect is:

where
(hf) is the energy of the incident photon, where
is the Planck constant
f is the photon frequency
is the work function of the material
is the maximum kinetic energy of the ejected electron
The minimum frequency of the light needed to extract an electron fro mthe surface of the material can be found by requiring that the maximum kinetic energy of the photoelectron is zero:

So we get

For silver, the work function is

Solving for f, we find the minimum frequency:

Learn more about photoelectric effect:
brainly.com/question/10015690
#LearnwithBrainly