What is the impulse given the wall?

[RUNVS]

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.

 

[heth]

Homework Equations

I= pf-pi/t

What do the letters stand for in this equation?

 

[RUNVS]

The letters stand for Impulse = final momentum - the initial momentum/ time

 

[Perillux]

the impulse is the change in momentum. So the equation is
change in momentum = (change in force) / time
if I'm not mistaken.

 

[heth]

Another way of writing it is:

Impulse = Force x time = change in momentum

 

[malawi_glenn]

you must have the perpendicular components, see picture:

Find out which arrows of momentum is contributing to the impulse on the wall.

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