CAN YOU SOLVE IT IN FIRST ATTEMPT

Algebra Level 3

After striking a floor certain ball rebounds 4/5th of its height from which it has fallen. find the total distance that it travels before coming to rest if it is gently dropped from height of 120 metres.


The answer is 1080.

Ashutosh Malviya by ashutosh malviya , 26, India

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1 solution

Ashutosh Malviya
Jan 12, 2015

It is a infinite geometric progression where 120 is the first term and 4/5 is the c.r so total distance= 2*[120/(1-4/5)]-120 =1080

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Use the same method :D

total distance = ( 2 × 120 1 − 4 5 ) − 120 = 1080 = ( 2 \times \frac{120}{1- \frac{4}{5}}) - 120 = \boxed{1080}

Andronikus Lumembang - 6 years, 5 months ago

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