3. One end of a rnassless spring is attached to a wall & another end is attached to a block of mass m = 20 g (as ' shown in Fig. 2). When the block is stretched horizontally to a distance 5 cm om its rest position, the force acting W on the block is 10 N. i. i Fig. 2 (a) (2 marks) Calculate the spring constant. (b) (4 marks) Now consider one end of the same spring system is attached to the ceiling. Take the hanging end point of the spring as reference to the gravitational potential. When the block is attached to the hanging end point of the spring, it extends a distance 0'. Calculate the value of d. Also calculate the block's total potential energy at this position. (0) (4 marks) Calculate the time period & angular 'equency for both the vertical and the horizontal oscillations