10. John does 176 J of work lifting himself a distance of 0.40 m. How
1 answer:
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The correct description of velocity is:
The boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish.
Explanation:
Velocity is a vector quantity, which tells the rate of change of position of an object.
Its magnitude is given by
where d is the displacement (change in position) and t the time elapsed, and its direction is the same as the displacement.
Therefore, being a vector, velocity has both a magnitude and a direction. Let's now analyze each choice:
<em>- Walking south along the two-mile canyon trail generally takes less time than traveling the same trail north because walking south is all downhill</em>. --> This statement only includes a direction, not a magnitude, therefore it cannot be a description of velocity.
<em>The motorcyclist traveled along a highway at 55 mph and reached the campsite in less than the two-hour estimated time. --> </em>This statement only includes a magnitude, not a direction, therefore it cannot be a description of velocity.
<em>The hiker began hiking the park's five-mile north hiking trail at 8:00 a.m. with plenty of daylight left to complete the hike before dark. --> </em>This statement only displacement but not the time taken to complete the path, so it is not possible to calculate the magnitude of the velocity
The boat traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish. --> This statement provides a displacement (200 meters north) and the time taken (5 minutes), so it is possible to calculate the magnitude of the velocity, and the direction is given by the direction of the displacement (north), therefore this is the correct option.
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