24. A water jet whose cross section area is a striker wall making an angle e with the normal and rebounds elastically. The velocity of water of density d is v. Force exerted on wall is :- 0 (1) 2avd cos 0 (2) 2avd sin 0 (3) 2avd cos 0 (4) avd cos 0 25. Two blocks of masses 5 kg and 10 kg are connected to a pulley as shown. What will be their acceleration if the pulley is set free? (g = acceleration due to gravity) (1) g (3) g/3 5 kg 10 kg (2) g/2 (4) g/4 26. Figure shows three blocks in contact and kept on a smooth horizontal surface. What is ratio of force exerted by block A on B to that of B on C :- (1) 1:2 (3) 1:3 F=16N A B 5kg 2kg 1kg (2) 2:1 (4) 3:1 27. If a = 2, b = 5 and | a 5 = 8 then a B is (1) 6 (2) 12 (3) 9 (4) 4 28. If A = 1 + 2j + 3k, B = 1 + j + 4k and C = 31 - 3 - 12k, then find the angle between the vectors (A + B + c) and (A x B). (1) 0 (3) 90 (2) 180 (4) 60