Forward from: Yogesh
Speed diminished=k*√wagon
42-33=k*√9
K=3
As reduced by 42 engine can't move
42=3*√wagon
Wagon=196
Maximum wagon that can be pulled 195
42-33=k*√9
K=3
As reduced by 42 engine can't move
42=3*√wagon
Wagon=196
Maximum wagon that can be pulled 195