Question

Two unequal masses are tied together with a cord with a compressed spring in between.
Which one is correct ?

• A. Both mases will have equal KE.
• B. Lighter block will have greater KE.
• C. Heavier block will have greater KE.
• D. None of above answer is correct

Answer 1

The correct option is B Lighter block will have greater KE.

$AsK=\frac{P^2}{2m}and|{\overrightarrow{P}}_1|=|{\overrightarrow{P}}_2|,hence\frac{K_1}{K_2}=\frac{m_2}{m_1}.$
i.e., KE of the two blocks will not be equal but in the inverse ratio of their masses and so lighter block will have greater KE.