Calculate the speed of an 7.0 × 104kg airliner with a kinetic energy of 1.4 × 109J. Answer in units of m/s.

Answer 1

K.E. = 1/2 m v^2 ... v = √[(2 K.E.) / m]

v = √[(2 * 1.4E9 J) / 7.0E4 kg]