Johnny Jumper's preferred trick is to step out of his 16th story window and fall 50.0 m into the pool. A news reporter takes a picture of 73.5 kg Johnny just before he makes a splash, by using an exposure time of 3.95 ms.

i) Determine Johnny's de Broglie wavelength at this moment.

ii) Determine the uncertainty of the kinetic energy measurement throughout such period of time.

iii) Determine the percent error caused by these uncertainty.