Question

A spring is kept compressed under a scooter of mass 120g. On releasing the pressure, the scooter moves out with a speed of 0.5ms -1. Calculate the potential energy of the compressed spring.

Answer 1

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Answer 2

Given: A spring compressed under scooter of mass 120g. On releasing, scooter moves out with speed 0.5m/s

To find: Potential energy of the spring

Explanation: When the spring is compressed under scooter, the entire energy is in the form of potential energy. When the spring is released, the energy gets converted to kinetic energy which helps the scooter to move forward.

Velocity of scooter(v)= 0.5 m/s

Mass of scooter(m)= 120g = 0.12 kg

Therefore, kinetic energy of scooter= 1/2*m* v^2

= 1/2*0.12*0.25

= 0.015 J

Since, all the potential energy was converted to kinetic energy, the value of potential energy is also equal to value of kinetic energy.

Therefore, the potential energy of the compressed spring is 0.015 J.