A 0.20 kg0.20\text{ kg}0.20 kg mass is suspended from a vertical spring.
The mass is pulled downwards until the spring has extended by 15 cm15\text{ cm}15 cm from its unstretched length.
The spring constant of the spring is 80 N/m80\text{ N/m}80 N/m.
What is the magnitude of the initial acceleration of the mass when it is released? (Take g=9.8 m/s2g = 9.8\text{ m/s}^2g=9.8 m/s2.)
183 exam-style questions on CIE IGCSE Physics 1.5.1a Forces, resultant force and motion. Each one has a worked solution and a mark scheme showing where the marks go.