When rubber band is stretched and then released, the two areas areas are different
The difference in energy is dissipated as internal energy
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Arrangement of atoms is changed
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Weight and reaction force from spring which is equal to tension in spring
Elastic potential energy is converted to kinetic energy and gravitational potential energy
The extension reduces and velocity and height increase
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Kinetic energy of trolley and block changes to strain energy of spring
Strain energy of spring changes to kinetic energy of trolley and block
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March 2020 Paper 12 Q20 | Ans: C
Area of triangle gives 0.10 but must be bigger
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Nov 2018 Paper 12 Q20 | Ans: D
It is stated it can withstand 4000 N without plastic deformation, it is not stated that 4000 N is the maximum, just that it is below the elastic limit, therefore the elastic limit must be above 4000 N
