Answer:
26 ) Stronger legs
30) the ball appear to have greater sped than that of the train to an observer on the earth.
Step-by-step explanation:
26) Longer feet will raise the centre of mass of the body,
reducing its stability. Lower the centre of mass , greater the stability of a body.
30) The velocity of the train will add up with the velocity of ball with respect to train to give its velocity with respect to the earth.