The moment of inertia of a cylindrical satellite about its axis is 7.2 kg per metre square it is given a spin about its Axis by firing small thruster Rockets that import a uniform angular acceleration of 1 upon 30 Radian per second square along that Axes if the satellite acquires a rotational kinetic energy of 0.04 June starting from the rest the duration for which the Rockets must be fired is what?