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Please HELP, I am stuck on this problem and I am not able to figure out...

Please HELP, I am stuck on this problem and I am not able to figure out because the book is giving km/s instead of the regular km/h and the professor gives us the final answer to self check but my answer using the formula lambda=h/p is not the same as his answer...not sure what I am doing wrong. I tried to convert to m/s but that didn't work.
What is the de Broglie wavelength of:

a) an electron (m=9.1x10^-31kg) traveling at 15 km/s?

b) an electron with a kinetic energy of 1eV?

C) a proton (m=1.67 x10^-27kg) travelling at 15km/s?

d) a promo with a Kinetic energy of 1eV?

e) an elephant (m=10 tonnes) traveling at 15km/h?

f) an elephant with a kinetic energy of 1eV?

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