(a)[2]
State two properties of an object that can be altered by the action of forces.
(b(i))[2]
The springs follow Hooke’s law. Explain the meaning of this statement.
(b(ii)(1))[1]
State the tension in each individual spring.
(b(ii)(2))[2]
Calculate the spring constant $k$ for each spring.
(b(iii))[2]
State the energy changes that occur as the two athletes use their muscles to stretch the chest expander.