4Elasticity Hookes Law Young ModulusHard1 mark
An 800 g mass is suspended from a light spring with a spring constant of 20 N / m. The mass is pulled down a further 10.0 cm from the equilibrium position without the spring going past the limit of proportionality. The mass is then released.
| resultant force on the mass | acceleration | |
|---|---|---|
| A | 2.0 N upwards | 2.5 m / s upwards |
| B | 7.8 N upwards | 9.8 m / s upwards |
| C | 9.8 N downwards | 9.8 m / s downwards |
| D | 200 N upwards | 0.25 m / s upwards |
Which row about the resultant force on the mass and its acceleration immediately after its release is correct?