H2P-475
Elastic potential energy
H2 Physics · JC 2 · Hard · Elastic potential energy
A spring obeys Hooke’s law and has spring constant 45 N m⁻¹. It is compressed by 0.060 m and used to launch a 0.040 kg ball along a smooth horizontal surface. Assuming all the elastic potential energy becomes kinetic energy of the ball, what is the speed of the ball as it leaves the spring?
- 2.0 m s⁻¹
- 1.0 m s⁻¹
- 4.0 m s⁻¹
- 0.64 m s⁻¹
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