The slope represents the acceleration
By definition we know that the force is the vector product of the vector of the current by the length with the magnetic field vector. The current in this case goes in a positive "Y" direction. If we assume that the magnetic field goes in the positive "K" direction, then the result will be in the positive "X" direction. Attached solution.
It’s definitely D: seeing all the options available to you and giving one a try
Answer:
A
Explanation:
if the man doubles his force to 40 and the box was yet to move that means acceleration also doubled so your answer would be A
Use of lubricant
Use of ball bearers
Use of streamlined body
Use of graphite