Answer:
The answer is A
Explanation:
Here's an example. A child is in school taking a test. They have made a mistake on a question, and want to erase it. The eraser is made out of a type of rubber, the rubber has friction, which means the eraser has something that's going to resist movement. Now the child has exerted enough force to get it moving, and it's moving, it won't stop unless the child stops exerting force to keep it moving. Both Newton's 1st and 3rd law explain the action of moving something on a surface with friction.
Density- It is a measurement of that how material is packed together tightly.
Its formula is ρ=m/v
where ρ is the density of material
m is the mass
v is the volume
here we have to find the length of cube's side
a cube of silver has a mass = 21 kg. = 21×10³ [∵1kg = 1000g ]
density of silver = 10.49g/cm³
the length of the cube's side = ?
v=m/ρ
l³ = 21×10³ /10.49 ≈ 2×10³ cm³
l =∛(2×10³)cm³
l = 1.26 ×10 = 12.6 cm
l = 4.96 inches [∵ 1 cm = 0.394 inch ]
the length of the cube's side is 4.96 inches
to know more about density :
brainly.com/question/10847047
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Answer: 
Explanation:
Given
final velocity at takeoff 
Acceleration of the plane can be 
Initial velocity is zero for the plane i.e. 
Using the equation of motion
![\Rightarrow v^2-u^2=2as\quad [\text{s=displacement}]\\\text{Insert the values}\\\Rightarrow (28.1)^2-0=2\times 2\times s\\\\\Rightarrow s=\dfrac{789.61}{4}\\\\\Rightarrow s=197.40\ m](https://tex.z-dn.net/?f=%5CRightarrow%20v%5E2-u%5E2%3D2as%5Cquad%20%5B%5Ctext%7Bs%3Ddisplacement%7D%5D%5C%5C%5Ctext%7BInsert%20the%20values%7D%5C%5C%5CRightarrow%20%2828.1%29%5E2-0%3D2%5Ctimes%202%5Ctimes%20s%5C%5C%5C%5C%5CRightarrow%20s%3D%5Cdfrac%7B789.61%7D%7B4%7D%5C%5C%5C%5C%5CRightarrow%20s%3D197.40%5C%20m)
Thu,s the minimum length must be
Answer:
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Explanation:
1 km/hr × (1000 m/km) × (1 hr / 3600 s) × 45 s = 12.5 m
