Q21. A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 20J in 1s. Which of the following statements is correct?Physics — Work, Power and Energy — Question 21 of 238A. The tension in the string is MgB. The tension in the string is FC. The work done by the tension on the block is 20J in 1sD. The work done by the force of gravity is 20J in 1sPractice more Physics MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →