Fleas have remarkable jumping ability. A 0.55 mgflea, jumping straight up, would

Question

Fleas have remarkable jumping ability. A 0.55 mgflea, jumping straight up, would reach a height of 30 cm if there were no air resistance. In reality, air resistance limits the height to 20 cm .

Part A

What is the flea's kinetic energy as it leaves the ground?

Express your answer to two significant figures and include the appropriate units.

Part B

At its highest point, what fraction of the initial kinetic energy has been converted to potential energy?

Express your answer using two significant figures.

Explanation / Answer

Here,

m = 0.55 *10^-6 Kg

h = 30 cm

part A)

flea's kinetic energy = m * g * hi

flea's kinetic energy = 0.55 *10^-6 * 9.8 * 0.30

flea's kinetic energy = 1.62 *10^-6 J

part b)

fraction of KE converted to PE = (0.20/0.30)

fraction of KE converted to PE = 66.7 %

fraction of KE converted to PE is 0.667

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