Q 11-04-033NEETJEE MainEasy
Three blocks of masses $2$ kg, $3$ kg and $5$ kg are placed in contact in a row on a smooth horizontal floor. A horizontal force of $50$ N pushes the $2$ kg block. The contact force between the $3$ kg and the $5$ kg blocks is
Answer: (B) $25$ N
Concept. Common acceleration; the last block is pushed only by the contact force.
Step 1. Acceleration. $\dfrac{50}{10} = 5\ \text{m/s}^2$.
Step 2. Contact force. $5 \times 5 = 25$ N.
Answer. $25$ N (Option B).
Solution by Sreeraj P, M.Sc Physics