Velocity –time graph for a Body of mass 10kg is shown in figure. Work done on the Body in first two seconds of the motion is
given m = 10kg t = 2 sec
work done by the body against retardation force =decrease in kinetic energy of the body.
u = 50m/s at t = 0 sec.
speed of the Body at t = 2 sec is
using work –Energy theory , W =