Block A, with a mass of 50 kg, rests on a horizontal table top.The coefficient of static friction is 0.40.A horizontal string is attached to A and passes over a massless, frictionless pulley as shown.The smallest mass mB of block B, attached to the dangling end, that will start A moving when it is attached to the other end of the string is: 
Definitions:
Clear and Convincing
A standard of evidence requiring a high level of certainty to establish a fact in legal proceedings, higher than the preponderance of evidence but lower than beyond a reasonable doubt.
Beyond a Reasonable Doubt
The highest standard of proof required in a criminal case, indicating that there is no plausible reason to believe otherwise than the defendant is guilty.
Circuit Courts
Courts that have appellate jurisdiction and cover a particular geographical area in the United States, also hearing a wide range of civil and criminal cases at the federal level.
Federal Court System
The judicial branch of the United States government, consisting of various levels of courts including the Supreme Court, appellate, and district courts.
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