Question

A block is pulled along a horizontal frictionless surface by a rope. The tension in the rope will be the same at all points on it:

• A. If and only if the rope is not accelerated
• B. If and only if the rope is massless
• C. If either the rope is not accelerated or it is massless
• D. Always

Answer 1

Answer: (C)

If either the rope is not accelerated or it is massless

Tension in the rope will be $T=(m_r+m_b)a$

if rope is massless then tension is

$T=m_{b}a$

if the acceleration is zero then $T=0$ throughout the rope.