Luttappi, a cute, innocent devil steps out of a 16th-story window and fall 50 m into a pool. Mayavi, a little devil, takes a picture of the 75 kg Luttappi just before he makes a splash, using an exposure time of 5.0 ms. Find (a) the Luttappi's de Broglie wavelength at this moment, (b) the uncertainty of his kinetic energy measurement during the 5.0 ms time interval. Write down your inference from this calculation.