A ball of mass 0.5 kg is moving with velocity \(( 2 \mathbf { i } - 3 \mathbf { j } ) \mathrm { m } \mathrm { s } ^ { - 1 }\) when it receives an impulse \(( 4 \mathbf { i } + 5 \mathbf { j } ) \mathrm { Ns }\). Find the gain in kinetic energy of the ball due to the impulse.
(6)