If a rubber ball falls from a height h and rebounds upto the height of h /2 . The percentage loss of total energy of the initial system as well as velocity ball before it strikes the ground, respectiv

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If a rubber ball falls from a height h and rebounds upto the height of h /2 . The percentage loss of total energy of the initial system as well as velocity ball before it strikes the ground, respectively, are :

TestHub · Accepted Answer

​ Velocity just before collision = 2 gh ​ Velocity just after collision = 2 g ( 2 h ​ ) ​ ∴ Δ KE = 2 1 ​ m ( 2 gh ) − 2 1 ​ mgh = 2 1 ​ mgh ∴ % loss in energy = KE i ​ Δ KE ​ × 100 = 2 1 ​ mg 2 h 2 1 ​ mgh ​ × 100 = 50% ​

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