Question

a ratio of the displacement of a freely falling body in the last second to the total displace ment if 11:36 the time travels is ...

Answer 1

Suppose the flight is of time t then height fallen in time t will be H=21gt2

And the height fallen in time t−1 second  will be h=21g(t−1)2

so the displacement of last second will be H−h=2g(t2−t2−1+2t) 

given that HH−h=3611

so we have t22t−1=3611

solving above equation we get  t=6second

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