Question

A block of mass 5 kg resting on a horizontal surface is connected by a cord, passing over a light frictionless pulley to a hanging block of mass $5\, kg$. The coefficient of kinetic friction between the block and the surface is 0.5. Tension in the cord is : $(g = 9.8 \,m/sec^2)$

• A. $49\, N$
• B. Zero
• C. $36.75\, N$
• D. $245\, N$

Answer 1

Answer: (C)

$36.75\, N$

Answer 2

For block A,
$T=\mu N=5a$ $N=5g$
For block B,
$5g-T=5a$
$\Rightarrow T = 36.75N, a = 2.45\, m/sec^{2}$