### Computing the takeoff speed and kinetic energy

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##### Reference no: EM1312568

For its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.5mm -long, 0.49 mg critter can reach a height of 20cm in a single leap.

[A] Neglecting air drag, find the takeoff speed of such a flea?
[B] In fact, most humans can jump no more than 60cm from a crouched start. Compute the kinetic energy per kilogram of mass at takeoff for such a 77kg person?
[C] If a 77 kg , 1.8 -tall human could jump to the same height compared with his length as the flea jumps compared with its length, how high could he jump, & what takeoff speed would he need?
[D] Compute the kinetic energy of this flea at takeoff & its kinetic energy per kilogram of mass.

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