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Answer:
7.5 m/s
Explanation:
We can find its velocity when it reaches the buoy by applying one of Newton's equations of motion:
where v = final velocity
u = initial velocity
a = acceleration
s = distance traveled
From the question:
u = 28 m/s
a = -4
s = 91 m
Therefore:
The velocity of the boat when it reaches the buoy is 7.5 m/s.
The vertical forces present in a boxcars being pulled by a train are weight and pull of air on the boxcars.
The forces exerted on an object can be resolved into <em>horizontal</em> and <em>vertical components.</em>
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The horizontal components of the forces on an object being pulled include the following;
- The frictional force on the object; which tends to reduce the motion,
- force dragging the object forward
- if the object is inclined to an angle, the horizontal component of the weight
This horizontal force is written as;
The vertical component of the force on the object include the following;
- the weight of the object acting downwards
- the pull of air on the object acting upwards
The vertical force on the object is written as;
Thus, the vertical forces present in a boxcars being pulled by a train are weight and pull of air on the boxcars.
Learn more here: brainly.com/question/2000189