Question

A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m by applying a force P at one end of the rope. The force which the rope exerts on the block is?

• A. $\frac{pM}{M-m}$
• B. $\frac{MP}{M+m}$
• C. $\frac{pm}{M+m}$
• D. $P$

Answer 1

The correct option is B $\frac{MP}{M+m}$

Acceleration of system = $\frac{P}{M+m}$

Force on the block = Mass of block $\times$ acceleration of system

= $M\times \frac{P}{M+m}$

= $\frac{MP}{M+m}$