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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Elastic and Inelastic Collision

  • question_answer
    A ball is allowed to fall from a height of 10 m. If there is 40% loss of energy due to impact, then after one impact ball will go up to                             [CPMT 1985]

    A)          10 m                             

    B)          8 m

    C)          4 m                               

    D)          6 m

    Correct Answer: D

    Solution :

             \[mgh=\] initial potential energy               \[mg{h}'=\] final potential energy after rebound               As 40% energy lost during impact \mgh'=60% of mgh          Þ \[h'=\frac{60}{100}\times h=\frac{60}{100}\times 10=6\,m\]


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