1.

An engine can move at the speed of 20/3 m/s without any wagon attached and reduction in the speed of the train is directly proportional to the square root of the number of wagons attached to the engine. When there are 9 wagons attached its speed is 5 m/s. The greatest number of wagons with which the engine can move is :

Answer»

144
12
143
24

Answer :C


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