Answer:
The displacement is zero miles
Explanation:
The displacement of an object that moves from point A to point B is defined as
Where d is the displacement of the object. The displacement does not depend on the trajectory of the object. It only depends on the linear distance between the end point and the starting point.
In this case we know that the person walks from home to work and then walks from work to home. Therefore, the total displacement is the linear distance between the point where its journey begins and the point where the route ends.
The tour begins on the front porch of your house and ends on the front porch of your house (when you return from work). If we call A to the front porch of the house then the displacement is:
The displacement is zero miles, since the person finishes the journey just where it started (front porch)
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Answer:
mass
Explanation:
This energy of motion is what we call kinetic energy. ... In fact, kinetic energy is directly proportional to mass: if you double the mass, then you double the kinetic energy. Second, the faster something is moving, the greater the force it is capable of exerting and the greater energy it possesses.
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Answer:
Positive
Explanation:
Protons have positive charges
Electrons have negative charges and
Neutrons have neutral charges.
Explanation:
This is simple.
Convert the speed of 45km/h to metres per second (m/s):
45 * 1000m = 45000m per hour.
1 hour = 60 seconds * 60 minutes = 3600 seconds.
45000m/h / 3600 = 12.5m/s
(A quicker way is just to divide by 3.6)
So in 20 seconds it would cover:
12.5m/s * 20s = 250m.
A car travelling at 45km/h would travel 250 metres in 20s.
