A body of mass 10kg initially at rest is subjected to a force of 20N for 1 second.calculate the change in kinetic energy during that time ?
acceleration is ... force / mass ... 2 m/s^2
average velocity for one second is ... 1 m/s
distance traveled is ... 1 m
energy (work done) is ... force * distance ... 20N * 1 m = 20 Joules