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5.Work, Energy, Power and Collision
normal

$20m $ ઉંચાઇ પરથી દડાને મુકત કરતાં $ 20\%$  ઊર્જા અથડામણમા ગુમાવે છે.તો રેસ્ટીટયુશન ગુણાંક

A

$0.89$

B

$0.56$

C

$0.23$

D

$0.18$

Solution

${h_2} = 80\% {\rm{ of }}{h_1}$  = $ \frac{{80}}{{100}} \times 20 = 16\,m$

$e = \sqrt {\frac{{{h_2}}}{{{h_1}}}} $$ = \sqrt {\frac{{16}}{{20}}} = \sqrt {0.8} $

$= 0.89.$

Standard 11
Physics

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