Question

Two blocks of masses $2$ kg and $5$ kg are connected by a light string passing over a frictionless pulley. The tension in the chord connecting the masses will be?

• A. $20$N
• B. $30$N
• C. $28$N
• D. $50$N

Answer 1

The correct option is B $30$N

Let acceleration due to gravity, g= 10 $m/s^2$

$T_1=m_{1}g$-------- (1)

$T_2=m_{2}g$----- (2)

Tension in the string, T=$T_1-T_2=m_{1}g-m_{2}g$

$T_1-T_2=5\times 10-2\times 10$

= 30 N