17. As per the given figure, two blocks each of mass 250g are connected to a spring of spring constant 2Nm 1. If both are given velocity in opposite directions, then maximum elongation of the spring is: (a) 22 250 g 250 g (b) (c) 24 (d) 18. A monkey of mass 50kg climbs on a rope which can withstand the tension (T) of 350 N. If monkey initially climbs down with an acceleration of 4 m/s and then climbs up with an acceleration of 5 m/s. Choose the correct option (g = 10 m/s). (a) T = 700 N while climbing upward (c) Rope will break while climbing upward downward (b) T = 350 N while going downward (d) Rope will break while going 19. Two projectiles thrown at 30 and 45 with the horizontal respectively, reach the maximum height in same time. The ratio of their initial velocities is: (a) 1:2 (b) 2:1 (c) 2:1 (d) 1:2 20. A screw gauge of pitch 0.5mm is used to measure the diameter of uniform wire of length 6.8cm, the main scale reading is 1.5mm and circular scale reading is 7. The calculated curved surface area wire to appropriate significant figures is: [Screw gauge has 50 divisions on its circular scale] (a) 6.8 cm (b) 3.4 cm (c) 3.9 cm (d) 2.4 cm