On a stationary belt, an object of mass $=1000$ ?grams is placed in equilibrium at point A$,$ ?attached to the end of an unstretched spring, and has k$=1000$ ?N$/$m$,$ ?L$0=40$ ?hrs$.$ ?When the belt moves at a speed $\mathrm{of\; 1}$ ?m$/$s An object is at rest at point B at position x $=30$ ?cm$.$

?$($a$)$ ?Write down the force acting on object B$.$

?$($b$)$ ?Find the value of friction.

?$($c$)$ ?Plot a graph of the force in the spring as a function of$\mathrm{ 1},$A$1$

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