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## Homework Statement

In the photograph , suppose the cart that launches the ball is 13 cm high. The vertical distance from the lowest ball to the highest is about two cart heights or 26 cm.

Estimate the time interval between successive stroboscopic exposures.

Link to the photograph: http://session.masteringphysics.com/problemAsset/1040728/5/Walker.4.44.jpg

## Homework Equations

Y=y0+V0t+1/2at

## The Attempt at a Solution

.26=0+2.3t+1/2*-9.81t^2

.26=2.3t-4.905t^2

-4.905t^2+2.3t-.26=0

t=-2.3+-sqrt 2.3^2-4*-4.905*-.26/-9.81

t=-2.3+-sqrt 5.29+19.62*-.26/-9.81

t=-2.3+-sqrt 5.29-5.1/-9.81

t=-2.3 +- sqrt .19/-9.81

t= 2.3+- .44/-9.81

t= .19, .28

**t= .19/3= .06**