I would like to ask the question 2 and 3, thx a lot.

RS = r, express r in the form Ap + uq. Find ) and / in terms of y, where y = p . q. (8 marks) 2. Forces of magnitude P, Q and R act along the sides BC, CA and AB, of a triangle ABC and forces of magnitudes, P', Q' and R' act along OA, OB and OC where O is the circumcenter of AABC. Prove that, if the six forces are in equilibrium (8 marks) PP QQ RR' P cos A + Q cos B + R cos C' = 0 and + + = 0 a b C I where a, b and c are the sides of AABC. Hint: Consider the moment of forces at various points of the triangle.] 3. A particle travels along a curved path. The position vector of it is given by T' = 5 cost2 i + 5 sint2 3 where t is time. (a) Describe the curve and find the acceleration of the particle. (4 marks) (b) Hence, find the radial and transverse components of the acceleration. (10 marks) 4. At a certain instant. a ship P is positioned 50 km due west of another ship Q. If ship P is