A tennis ball is dropped from 1.31 m above the ground. It rebounds to a height of 0.936 m. With what velocity does it hit the ground? The acceleration of gravit

Question

I do not know what the starting or ending velocity is and the question is worded poorly.

Answer 1

Givens: 

y1= 1.31m

y2= 0.936m 

vf=? 

Vi= 0 (since it starts from rest) 

 

 

Use this kinematics equation: 

 

vf^2=vi^2 + 2ay

 

vf^2= (0)^2 +2(9.8m/s^2)(1.31m) 

 

vf=Sqrt(25.676) 

 

vf= 5.07 m/s