Free fall

The free fall body has gone 10m in the last 0.5s. Find the body speed at the moment of impact.

Correct answer:

v =  22.5 m/s

Step-by-step explanation:

t=0.5 s s=10 m  g=10 m/s2  s = 21   g  t12  21   g  (t1t)2 2 s/g = t12  (t1t)2 2 s/g = t12  t12 + 2 t t1  t2 2 s/g + t2 = 2 t t1  t1=2 tt2+2 s/g=2 0.50.52+2 10/10=49=2.25 s  v=g t1=10 49=410 9=490=245 m/s=22.5 m/s

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