a) What is the minimum time in which one can hoist a 1.00-kg rock height of 10.0m if the string used to pull the rock up has a breaking strength of 10.8 N? Assume the rock to be initially at rest.(adsbygoogle = window.adsbygoogle || []).push({});

b) If the string is replaced by one that is 50% stronger, by what percentage will the minimum time for the hoist be reduced.

a)

i just used a= 2(x-xo)/t^2 and then i got 2(10)/t^2 = 10.8/1

so i got 10.8=20/t^2 and so t would be root 10.8 but the answer is 4.5seconds... how?

b) i need to get a) to solve this...

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# Homework Help: Minimum time for a tension

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