The left ventricle of the heart accelerates blood from rest to avelocity of +24c

Question

The left ventricle of the heart accelerates blood from rest to avelocity of +24cm/s.
(a) If the displacement of the blood during the acceleration is+1.7 cm,determine its acceleration (in cm/s2).
1_________ cm/s2

(b) How much time does blood take to reach its final velocity?
__________ s

I don't know what equations to use for these problems. For part a,do I first have to the time it takes to get to the givendisplacement? That's how I first went about it, but couldn't findthe right numbers. Thanks

Explanation / Answer

Initial velocity   u = 0 Final velocity v = 24 cm / s distance S = 1.7 cm (a). from the relation v ^ 2- u ^ 2= 2aS from this accleration a = [ v ^ 2- u ^ 2] / 2S                                  = 169.41 cm / s ^ 2 (b). timetaken t = [ v - u ] / a                         = 0.14166 s

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