A) 20 cm
B) 70 cm
C) 30 cm
D) 80 cm
Correct Answer: B
Solution :
[b] \[{{m}_{1}}g=20N;{{m}_{2}}g=30N\Rightarrow {{m}_{1}}g{{\ell }_{1}}={{m}_{2}}g{{\ell }_{2}}\] \[\therefore 20\times 30=30{{\ell }_{2}};\,\,\therefore {{\ell }_{2}}=20cm;\] \[\therefore x=\left( 50+20 \right)\] \[=70\text{ }cm\]You need to login to perform this action.
You will be redirected in
3 sec