Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Math Forum
»
Discussions
»
sci.math.*
»
sci.math
Notice: We are no longer accepting new posts, but the forums will continue to be readable.
Topic:
1.96  Can definitions be wrong?
Replies:
2
Last Post:
Jul 7, 2014 7:19 PM




Re: 1.96  Can definitions be wrong?
Posted:
Jul 7, 2014 3:35 PM


On Monday, July 7, 2014 2:41:39 PM UTC4, John Gabriel wrote: > Example for morons: > > > > The distance function is given by s(t)= 50t+3. > > > > Using the New Calculus, answer the following questions: > > > > 1. Find an equation for the speed at any given time t. > > 2. What can you say about the speed at any given time t? > > > > Soln: > > > > 1. v(t)=s'(t)= {s(t+n)s(tm)}/(m+n) = { 50(t+n)+3  [50(tm)+3] } / (m+n) > > = { 50t+50n+3  50t+50m3 } / (m+n) > > = 50(m+n)/(m+n)=50 > > > > So equation for speed at any given time t is: v(t)=50 > > > > 2. The speed is constant.
v(t) is the first derivative of s(t). Are you now saying that the derivative of a linear function is defined after all?
Dan Download my DC Proof 2.0 software at http://www.dcproof.com Visit my Math Blog at http://www.dcproof.wordpress.com



