Answer:
The answer is B.
Explanation:
We measure acceleration as a m/s2 because we are measuring the rate of change in velocity. Therefore, meters per second is the velocity of the object, and the second per second is the velocity added per second. For example, A vehicle is travelling at 75 m/s. Because it is on the road, it must stop at a light 150 meters ahead. To make it in time, the vehicle must apply a negative acceleration of at least 25 m/s2 to stop in time. The driver is in a hurry, so when the light turns green, the vehicle accelerates at a rate of 25 m/s2. That means that each second, the vehicle's velocity increases by 25 m/s. Make sense???
Answer:
The man's velocity relative to the moving walkway is, v₂₃ = 0.2 m/s
Explanation:
Given data,
The speed of the moving walkway, v₁₂ = 0.9 m/s
The speed of the man walking on a walkway to the stationary observer, v₁₃ = 1.1 m/s
The speed of the man walking on a walkway to the walkway, v₂₃ = ?
The formula for relative velocity is,
<em> v₁₃ = v₁₂ + v₂₃</em>
∴ v₂₃ = v₁₃ - v₁₂
Substituting the values,
v₂₃ = 1.1 - 0.9
= 0.2 m/s
Hence, the man's velocity relative to the moving walkway is, v₂₃ = 0.2 m/s
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Answer:
The lines of the magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the North pole and into the South pole of the magnet. Permanent magnets can be made from ferromagnetic materials.
As can be visualized with the magnetic field lines, the magnetic field is strongest inside the magnetic material. The strongest external magnetic fields are near the poles. A magnetic north pole will attract the south pole of another magnet, and repel a north pole.