Question

An engine is used to pull several railway coaches. The unloaded engine runs at a speed of 60 mph. The reduction in its speed is directly proportional to the square root of the number of coaches pulled. When 16 coaches are attached, the speed drops to 44 mph.

a) What will be the speed when 36 coaches are attached?

1) 24 mph 2) 33 mph 3) 36 mph 4) 40 mph​

Answer 1

Step-by-step explanation:

your answer is above attachment

Answer 2

Answer:

36

Step-by-step explanation:

max speed is 66 mph.

speed reduction is directly proportionate to square root of no of coaches.

therefore, SR ∝ k √N

16 = k√16

k=4

SR= 4√N

    = 4√36

    =24

final speed= 60-24=36

therefore answer= 36