(a) The energy possessed by a body by virtue of its motion is called kinetic energy
(b) Mass increases, kinetic energy increases mass . is doubled kinetic energy also doubled. Velocity increases, kinetic energy increases, Velocity is doubled kinetic energy becomes four times.
(c) Kinetic energy KE = \(\frac{1}{2}\) mv2
= 1/2 × 20 × 52 = 1/2 × 20 × 25 = 250J