There is an 18 metre high platform for bungy jumping on, Ask an Expert

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There is an 18 metre high platform for bungy jumping. On jumping you go up and down a number of times before reaching a stable position from where you can be brought back to the ground. The first rebound is 6 metres high and this distance gets smaller by 20% each time you bounce back.

Answer the following;

Calculate the number of times you will bounce back before the distance of the rebound falls below 50cm?

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