Question

Two bodies of masses $4kg$ and $6kg$ are attached to the ends of a string passing over a pulley. The $4kg$ mass is attached to the table top by another string. The magnitude of tension in this string $T_1$ is equal to ($g=10m/s^2$)

• A. 10 N
• B. 10.6 N
• C. 25 N
• D. 20 N

Answer 1

Answer: (D)

20 N

Considering the 6 kg block as a system ,

we get, $T=6g=60N.$........................(1)

As it will not move because other side the string is connected to the table.

Now,

for 4kg block as a system,

$T-T1=4g$,

$T-T1=40$,

$60-T1=40$,..........................from (1)

$T1=20N$