While catching a fast moving cricket ball, why do fielders gradually pull back their hands backwards with the moving ball? Please advice which among the following is the correct answer. If both are incorrect kindly give the correct answer:
A: By pulling the hands backward the fielder increases the time during which the high velocity of the moving ball decreases to 0. Thus, the acceleration of the ball is decreased and therefore the impact of catching the fast moving ball is also reduced.
B: By pulling the hand backwards, the fielder gradually and continuously decreases the momentum of the moving ball and thereby reducing the velocity to zero.
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closed as too localized by David Zaslavsky♦ Feb 9 '12 at 17:13
This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, see the FAQ.
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If you consider the hands as the frame of reference, moving them backwards by accelerating negatively reduces the acceleration of the ball in that frame. Hence the impact of the ball (the force) is reduced (Newton's second law). Let $\vec{a_1}$ be the acceleration of the ball in the initial frame of reference and $\vec{a_2}$ the acceleration of the hands. The resulting force with the hands moving backwards $\vec{F_{backwards}} = m*(\vec{a_1}-\vec{a_2}$) will be lower than the force without : $\vec{F} = m*\vec{a_1}$. The fielder gradually absorbs energy from the ball to reduce the impact. |
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