TS EAMCET Medical 8 May 2024 Shift 1 Paper

A block enters a rough horizontal surface with a speed of 6ms−1 at x=1.5m and leaves the rough horizontal surface with a speed of 4ms−1 at x=2.5m. If the retarding force acting on the block is F=−25x (where F is in newton and x is in meter), then the mass of the block is