Starting from rest, a 0.00018kg flea springs straight upward.While the flea is p

Question

Starting from rest, a 0.00018kg flea springs straight upward.While the flea is pushing off from the ground, the ground exerts anaverage upward force of 0.41N on it. This force does +0.00021J ofwork on the flea. A) what is the speed of the flea when it leaves theground? B) Ignoring both air resistance and the flea's weight, how farupward does it go while pushing off? Starting from rest, a 0.00018kg flea springs straight upward.While the flea is pushing off from the ground, the ground exerts anaverage upward force of 0.41N on it. This force does +0.00021J ofwork on the flea. A) what is the speed of the flea when it leaves theground? B) Ignoring both air resistance and the flea's weight, how farupward does it go while pushing off?

Explanation / Answer

A.) Work = KE (change in kinetic energy) .00021 J = 1/2 m *(V2^2 -V1)       V1 = 0   m = .00018 kg Solve for V2 B.) h (change in height) = Work/(mg) h = .00021/(.00018*9.81)

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