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What is the impulse given the wall?

  • Thread starter RUNVS
  • Start date
  • #1
2
0

Homework Statement



A tennis ball of with a mass of .045 kg and speed of 25 m/sec strikes a wall at an angle of 45 degrees and rebounds with the same spped at 45 degrees. What is the impulse given the wall?

Homework Equations



I= pf-pi/t

The Attempt at a Solution



I= mv-mv/t
(.045)(25)-(-.045)(25)/1
1.125-1.125/1
I=2.25
I know the answer is 2.1, but don't know how to get it.
 

Answers and Replies

  • #2
108
0

Homework Equations



I= pf-pi/t
What do the letters stand for in this equation?
 
  • #3
2
0
The letters stand for Impulse = final momentum - the initial momentum/ time
 
  • #4
Perillux
the impulse is the change in momentum. So the equation is
change in momentum = (change in force) / time
if I'm not mistaken.
 
  • #5
108
0
Another way of writing it is:

Impulse = Force x time = change in momentum
 

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