a body of mass 8 kg moves in a straight line uniformly accelerated 3 m / s on a horizontal surface in the action of force 84 N. Find the coefficient of friction of the body and the surface of motion.

Does anyone know how to solve this problem? i really need . i made an attempt but i just cant get it. a metal rod is 25.000 cm long at 25.0 degrees celsius. when heated to 102.0 degrees celsius, it is 25.054 cm long. what is the coefficient of linear expansion for this metal.

J. j. thomson’s experiment disproved the theory that an atom

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?