1. (b) State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.   2. (a) Mention any two differences between the mass and weight of a body.   3. (c) A uniform metre scale is kept in equilibrium when supported at the 60 cm mark and a mass M is suspended from the 90 cm mark as shown in the figure. State with reasons, whether the weight of the scale is greater than, less than or equal to the weight of mass M.   4. (d) Draw a graph showing the relationship between acceleration and mass for a constant force.