Questions
The length of an elastic string is x when the tension is 5N. Its length is y when the tension is 7N. What will be its length, when the tension is 9N?
a
2y+x
b
2y-x
c
7x-5y
d
7x+5y
detailed solution
Correct option is B
We have, F=kx where, F,x and k are force, length and constant respectively. ∴ 5=kx..........(1) and 7=ky..........(2) Multiplying eq. (2) by 2 14=2ky..............(3) Subtracting eq. (1) from (3). 14-5=2ky-kx or 9=k(2y-x) Hence, required length =2y-xTalk to our academic expert!
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