<prompt> The kinetic energy of the body is least in one of the following phases of walking cycle;Heel strike.Mid-stanceDouble supportToe-off  <response>: Ans. is b i.e. MidstanceRef.: Grays 38the p 898 899According to Grays- In walking each foot is on the ground stance phase for about 60 of the stride and off swing phase for about 40. Thus single support phases one foot on the ground alternate with double support phases two foot.Grays further states- The speed and so the kinetic energy of the body passes through a maximum in each double-support phase and a minimum in each single support phase.Here are various phases of waling cycle:Double Support phases of the walking - Heel Strike cycle includes - - Foot flatToe flatSingle limb support phases of the - Mid stance walking cycle includes - - Heel offMid swingSo the answer is obvious now because the only single limb support phase in the question is mid stance. 