A particle performs SHM along a straight line and its position is vec(R ), acceleration is vec(a), velocity is vec(v) is and force on particle is vec(f). Then which of the following statement are true? (i) vec(v). vec(a) is always + ve (ii) vec(v).vec(R ) may be -ve (iii) vec(f).vec(R ) is always -ve (iv) vec(v) is parallel to vec(f) sometimes

A particle performs SHM along a straight line and its position is vec(

1.	A particle performs SHM along a straight line and its position is vec(R ), acceleration is vec(a), velocity is vec(v) is and force on particle is vec(f). Then which of the following statement are true? (i) vec(v). vec(a) is always + ve (ii) vec(v).vec(R ) may be -ve (iii) vec(f).vec(R ) is always -ve (iv) vec(v) is parallel to vec(f) sometimes
Answer» II, III & iv i, ii & iv i, iii & iv ii & iii Answer :A

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