Answer :

a.) At t<0, the body is in equilibrium, thus the forces on left and right must be equal. for t<0

b.) This option is incorrect because the term is a vertical force and thus cannot be fitted into the given equation as the given equation represents horizontal forces .

c.) Since the force on the left is withdrawn then and since it has not been withdrawn . Thus this option is incorrect.

d.) is non-zero but , thus, instead of it should be written as . Thus this option is also incorrect.

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