# physics

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an elastic ball rebounces 70% when it is dropped from the height. if it is dropped from 60m what is the total distance travelled by the ball

• physics -

60+.7*60(2)+.7^2(60)*2+...

Sum from n=0 to large [2*60*.7^n) -60

sum 120*.7^n -60

geometric ratio,

= 120/(1-.7) - 60
= 120/.3 -60
=400-60=340

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