Verified Answer :

wavelength = plancks constant/(massvelocity) 
plancks constant= 6.63
10^-34 with units of J-s or kg-m^2/s^2-s 
mass = 143g = 0.143kg 
velocity = 95mi/1hr(1609.3m/1mi)(1hr/3600sec) = 42.4676m/s 
h/mv = 6.6310^-34kg-m^2/s^2-s/(42.4676m/s0.143kg... 
wavelength = 1.3*10^-34 m (really small) 
good luck! (always make sure units cancel out)

Answer:

De-Broglie wavelength of the baseball is \(1.08\times 10^{-34}\ m\)

Explanation:

It is given that,

Mass of the baseball, m = 143 g = 0.143 kg

Velocity of the baseball, v = 95 m/h

Converting m/h to m/s

1 m/h = 0.447 m/s

Velocity of the baseball, v = 95 m/h = 42.46 m/s

De-Broglie wavelength is given by :

\(\lambda=\dfrac{h}{mv}\)

h is Planck's constant

\(\lambda=\dfrac{6.6\times 10^{-34}}{0.143\times 42.46}\)  

\(\lambda=1.08\times 10^{-34}\ m\)

Hence, the De-Broglie wavelength of the baseball is \(1.08\times 10^{-34}\ m\)