Question on #9 from Quiz 1 Preparation in Workbook

[TramHo2G]

"Calculate the de Broglie wavelength of a 0.155 kg ball traveling at 85.0 m.s^-1"
I tried to solve this problem using the wavelength=h/p equation.
I did 6.626*10^-34 J.s / (.155 kg)(85.0 m.s^-1)= 3.63*10^-31 m
The answer in the back was actually 5*10^-35 m.
Can someone tell me what I did wrong and how I can get the right answer?

[Chem_Mod]

You set up the problem correctly but made a mistake when entering it into your calculator. Make sure you're dividing h by the product of the mass and velocity; it seems like you divided h by mass and then multiplied that answer by the velocity. Use parentheses as needed when plugging any expression into your calculator.