If a freight car is moving on a frictionless surface atconstant speed, and then

Question

If a freight car is moving on a frictionless surface atconstant speed, and then a load of material is dropped into thetruck's open compartment, what happens to the truck's speed? a. increases b. decreases c. remains the same d. becomes zero e. not enough info given Logically I assume the speed would decrease, but the wordfrictionless confuses me. If a freight car is moving on a frictionless surface atconstant speed, and then a load of material is dropped into thetruck's open compartment, what happens to the truck's speed? a. increases b. decreases c. remains the same d. becomes zero e. not enough info given Logically I assume the speed would decrease, but the wordfrictionless confuses me.

Explanation / Answer

f a freight car is moving on a frictionless surface atconstant speed, and then a load of material is dropped into the truck's open compartment,truck's speeddecreases If the surface is frictional less the momentum of the truck andmaterial system conserved .            Thatis total initial momentum = total final momentum                                             mu = ( M + m ) v                                                    v = mu / ( M + m)                                                       

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