Question

Three masses of 500 g, 300 g and 100 g are suspended at the end of a spring as shown and are in equilibrium. When the 500 g mass is removed suddenly, the system oscillates with a period of 2 seconds. When the 300 g mass is also removed, it will oscillate with period:

• A. 2 s
• B. 1.25 s
• C. 1.5 s
• D. 1 s

Answer 1

The correct option is D 1 s

$2=2\pi \sqrt{\frac{(0.3+0.1)}{k}}.............\left(i\right)$
$T=2\pi \sqrt{\frac{0.1}{k}}...................................\left(ii\right)$
Solving these two equations we get,
$T=1s$