If it takes 50 n to kee a 100 kg box sliding across a floor, what is the coefficient of friction?

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.