Question
An engine without wagon can go at the rate of 24 kmph and its speed diminishes by a quantity which varies as the square root of the
number of wagons attached. With four wagons its speed 20 kmph. The greatest number of wagons with which the wagon can move is :
Answer: Option A
:
A
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:
A
Decrease in speed = 24 - 20 = 4
4=k√4⇒k=2
Now, for the speed to decrease to zero
24=k√x, where x is the number of wagons which
will stop the engine
X= 144
The greatest number of wagons with which the wagon can move is 143
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