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April 1st, 2017, 08:51 PM   #11
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Originally Posted by Posher View Post
I believe that this question is rather debatable as the weight has not been given would I be right in assuming this
What do you mean debatable? The question asks to list your assumptions, so you can safely pick a reasonable value for the mass of tennis ball, as skeeter has given.

But even then, a symbolic interpretation is often more meaningful in these situations. You can fiddle around with various values of $m$ to see how it has an impact on the momentum of the ball. Try some large values for mass, then try some smaller ones, what do you observe.
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April 2nd, 2017, 03:35 AM   #12
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A problem that asks for an estimate debatable? Don't believe so.

One may use $20m$ as the magnitude of the initial momentum, $16m$ as the magnitude of the final momentum, and $\sqrt{20^2+16^2} \cdot m$ as the magnitude of the change in momentum. In other words, carry the scalar multiple of mass along with your calculations until you determine a reasonable estimate for the ball's mass ... which can be looked up or measured directly.

By the way, you do know that weight is not the same thing as mass, correct?
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April 2nd, 2017, 02:33 PM   #13
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Yes I know that mass differs from weight. Weight is Fw = m*g where g is 9.81
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April 25th, 2017, 07:13 AM   #14
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No you can't assume the weight
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