- #1
NasuSama
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Homework Statement
Assume there is no air friction. A ball of mass m = 3.39 kg is dropped from rest at height h = 1.51 m. It hits the ground, losing energy ΔE = 1/11 of its total energy in the collision. How high will the ball bounce upward before it comes momentarily to rest?
Homework Equations
U = mgh
KE = ½mv²
The Attempt at a Solution
mgh = ½mv_f² [At the start before the first bounce]
v_f = √(2gh) ≈ 5.44 m/s
½mv_f² = 10/11 * mgh_n where h_n is the new height
h_n = 11/20 * v_f²/g ≈ 1.66 m, which is wrong.