A 225-kg crate is pushed horizontally with a force of 690 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.

2 answers

friction force = 225*9.81*.2 = 441 N
690 - 441 = m a = 225 a
a = 1.11 m/s^2
How did you get from 225 to 1.11?