A 500 g ball is released from a height of 4 m . Each time it makes contact with the ground, it loses 25 % of…

A 500 g ball is released from a height of 4 m. Each time it makes contact with the ground, it loses 25% of its kinetic energy. Find the kinetic energy it possess just after the 3rd hit

  1. 15 J
  2. 11.25 J
  3. 8.44 J
  4. none of these

Solution

After first hit K.E1=e2 K.E

3/4 K.E=e2 K.E ⇒ e2=3/4

K.E. after third hit= ( e 2 ) 3

KE= 27 64 mgh = 276412.10.4

= 27516=13516= 8.44 J

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