Question

length of seconds pendulum is 100 cm find the length of another
pendulum whose time period is 2.4 second

Answer 1

time period of seconds pendulum =2sec
length=100 given
100cm =2sec
x cm =2.4sec
do cross multiply
x×2 = 2.4×100
2x=240
x=240/2
x=120 Cm is length

Answer 2

Given:

Length,

= 100 cm

Time period,

= 2 sec.

To find:

Length of another pendulum = ?

Solution:

By applying multiplication, we get

⇒ $x\times 2=2.4\times 100$

⇒      $2x=240$

          $x=\frac{240}{2}$

             $=120 \ cm$

Thus the correct answer is "120 cm".