Question

Particle of mass 0.3 kg is subjected to a force F = –kx with k = 15 N/m. What will be its initial acceleration if it is released from a point 20 cm away from the origin:

• A. $3m/s^2$
• B. $5m/s^2$
• C. $15m/s^2$
• D. $10m/s^2$

Answer 1

The correct option is D

$10m/s^2$

mass = 0.3 kg, x = 20 cm
K = 15 N/m
F = -kx = ma
$-15\times \frac{20}{100}=0.3aa=-10m/s^2$
-ve sign indicates acceleration is towards mean position