# M3 (Edexcel): KinematicsWatch

#1
Here's the question I'm having trouble with:

When t = 0, v = 0 and x = 0
Show that
I just can't see where the t comes from.
Thanks in advance for any help.
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10 years ago
#2
a= d/dx(0.5v^2) = 3x^0.5
intergrate, then rearrange to get v as the subject.
then u know that v = dx/dt, so put all the terms containing x on one side and t on the other side. then integrate and then u need to rearrange it to get it in the form u want.

hope that helps
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10 years ago
#3
Hi,

Well

so integrating them up gives an expression like:

so if you integrate them up again you'll get the answer you posted (just worked it through myself)
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#4
Thank you.

I thought that was the way to do it but was doing the second integration wrong.
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