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  4. A tennis ball of mass m strikes a wall with a velocity v and retraces the same path. Calculate the change in momentum

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Q. A tennis ball of mass $m$ strikes a wall with a velocity $v$ and retraces the same path. Calculate the change in momentum

COMEDKCOMEDK 2014Laws of Motion

Solution:

Initial momentum, $p_i = mv$
Final momentum, $p_f= -mv$
$\therefore $ Change in momentum $= p_f - p_i$
$ \, \, \, \, \, \, = -mv - mv = -2mv$
Initial momentum, $p_i = - mv$
Final momentum, $p_f= mv$
$\therefore $ Change in momentum $= p_f - p_i$
$ \, \, \, \, \, \, = mv -(- mv) = + 2mv$

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