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RE: loader surcharge at top of retaining wall

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>Thus F = ma is still valid "if" the time interval is known
The second law of motion is always valid. Because there are two unknows, 
you use the energy balance to find the displacement (and subsequently the 
acceleration) from kinetic energy = Integral(Fdx). The energy balance and 
the second law of motion are independent, and entirely valid and both are 
required to solve the problem.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)