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September 20, 2014

September 20, 2014

Posted by **Jane** on Saturday, September 8, 2012 at 12:13am.

Find the average speed of the particle in the first 7 seconds

- Physics -
**Henry**, Sunday, September 9, 2012 at 4:05pm= t^3 - 6t^2 - 15t - 5.

Xo=0^3 - 6*0 - 15*0 - 5 = -5 cm @ t = 0.

X=7^3 - 6*7^2 - 15*7 - 5 = -61 cm @ 7s.

V = D/t = (X-Xo)/t.

V = D/t = (-61-(-5)) / 7 = 56 / 7=-8cm/s

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