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January 28, 2015

January 28, 2015

Posted by **Sydney** on Monday, June 1, 2009 at 4:59pm.

(v=velocity)

Please help me. Thank-you!

- Physics -
**MathMate**, Monday, June 1, 2009 at 5:14pmSince it is not specified in the question, we will assume that the equation for v as a function of time is in m/s.

Thus

v(t)=45(1-(0.804)^t) m/s

where t is in seconds.

A plot of the graph of v(t) versus t will shed some light.

http://i263.photobucket.com/albums/ii157/mathmate/terminalVelocity.png

Let v1=98% of terminal velocity of 45 m/s

then we look for the value of t1 such that

v(t1)=45*0.98

or

45*(1-0.804^t1) = 45*0.98

0.804^t1=1-0.98=0.02

Can you take it from here?

Hint: solve for t1 either by trial and error or apply the laws of logarithm.

- Physics -
**Chantel**, Sunday, January 13, 2013 at 1:42pm0.804^t= 0.02

t*log(0.804)-log(0.02)

t=log(0.02)/ log(0.804)

t= 17.9

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