JEE Main 2026 Model Paper 1

A block of mass 2 kg moving on a horizontal surface with speed of 4ms−1 enters a rough surface ranging from x=0.5m to x=1.5m. The retarding force in this range of rough surface is related to distance by F=−kx where k=12Nm−1. The speed of the block as it just crosses the rough surface will be: