A baseball player catches a baseball thrown to them in their mitt with their wrist did not bend such that all the impact went into the palm of the hand. The baseball of mass 150g was traveling at 95 mph when it was caught by the player. The impact was absorbed by the bones of the hand. Model the bones of a hand as solid sheet of length 7 cm and width 5 cm, with a depth of 1.5 cm. How much did the bone compress on impact with the ball

Inelastic is the answer your looking for.

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The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)