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 40 cm if there were no air resistance. In reality, air resistance limits the height to 20 cm .

I need help with this question!

I guessed on part A and got it right but dont know how to exactly do it. Can you do part A and B with work and an explaination please!?

Thanks so much I appreciate it.

previous 11 of 1 next » Problem 10.56 Part A Fleas have remarkable jumping ability. A 0.55 mg flea, jumping straight up, would reach a height of 40 cm if there were no air resistance. In reality, air resistance limits the height to 20 cm What is the flea's kinetic energy as it leaves the ground? Express your answer to two significant figures and include the appropriate units. K= 2.2x10-3 mJ Submit My Answers Give Up Correct Significant Figures Feedback: Your answer 2.156-10-3 mJ was either rounded differently or used a different number of significant figures than required for this part. 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. f- Submit My Answers Give Up Continue

Explanation / Answer

1
from the 'ideal' situation we can calculate initial KE
KE = ideal GPE
KE = m g h = 0.55*10^-6 kg (9.81 N/kg) (0.40 m) = 2.15*10^-3 mJ

2
we may use this ratio
actual GPE / ideal GPE = m g h_a / m g h_i = h_a/h_i = 20/40 = 0.50 or 50.%
this means that 50% is retained so 50% is lost

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