We assume
(acceleration is constant. We apply the equation
where s is the distance to stop
. We find the acceleration from this equation
We know the acceleration, thus we find the distance necesssary to stop when initial speed is
The force with which the student is acting in the chair and the force of the chair acting on the student is 588 N
Explanation:
- There are two kinds of forces acting on you when you are sitting on the chair, they are the gravitational force and the force exerted by the chair on you.
- The forces acting on the chair when you are sitting are the gravitational force and the force exerted by you.
- As per Newton's third law of motion, for every action, there is an equal and opposite reaction.
- Hence, F = ma
that is, F = 60 * 9.8
=588 N
- So, 588 N force should be applied from both sides then only you can sit properly in the chair.
<h2>
Answer: Toward the center of the circle.</h2>
This situation is characteristic of the uniform circular motion , in which the movement of a body describes a circumference of a given radius with constant speed.
However, in this movement the velocity has a constant magnitude, but its direction varies continuously.
Let's say 
is the velocity vector, whose direction is perpendicular to the radius 
of the trajectory, therefore
the acceleration 
is directed toward the center of the circumference.
Answer:
Other than the fact that momentum is a "vector" quantity I wouldn't know.
If the car had a momentum opposite to the chosen positive direction then its total momentum would be negative.
