A ball is dropped from a height of 10 m. It strikes the ground and rebounds up to a height of 2. m. During the collision, the per cent loss in the kinetic energy is
Two particles with charges q1 and q2 are kept at a certain distance to exert force F on each other. If the distance is reduced to one-fifth, then the force between them is
The following table gives the details of the number of students in class 10 section A and B who had taken mid-term and final exam. The % of students in section A is ____ (round to one decimal).