Finding how long it will take the ball to reach 20m

[max1020]

1. The problem is the pitch was clocked at 160km/h and if a pitch were thrown horizontally with this velocity how far would the ball fall vertically by the time it reached home plate 20m away?



2. I used the average acceleration



3. t=d*average velocity
t= 20m * 160km/h
Convert 160km to m and then I got 20000 but it wrong bc the answer is 9.9 x 10^-1

 

[berkeman]

1. The problem is the pitch was clocked at 160km/h and if a pitch were thrown horizontally with this velocity how far would the ball fall vertically by the time it reached home plate 20m away?



2. I used the average acceleration



3. t=d*average velocity
t= 20m * 160km/h
Convert 160km to m and then I got 20000 but it wrong bc the answer is 9.9 x 10^-1

It's good to use units as a sanity check of your calculations. Check the units on this calculation of yours, and then think about how you can re-arrange the equation to make the units work out...

"t= 20m * 160km/h"