A. 50 cm from steel wire
B. 25 cm from steel wire
C. 33.3 cm from steel wire
D. 13.3 cm from steel wire
The length of an elastic string is 'a' metres when the longitudinal tension is 4 N and 'b' meters when the longitudinal tension is 5 N. The length of the string in metres when the longitudinal tension is 9 N is: