JEE Main 9 Jan 2019 Shift 1 Solved Paper

A block of mass m, lying on a smoothhorizontal surface, is attached to a spring (ofnegligible mass) of spring constant k. The otherend of the spring is fixed, as shown in thefigure. The block is initally at rest in itsequilibrium position. If now the block is pulledwith a constant force F, the maximum speed ofthe block is :