(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I already know the answers because this is a review sheet, but I don't understand how to solve number 1, and I don't understand the wording of number 2.

1) A particle is moving along the x-axis and has a position given by x=(24t-2.0t^{3})m, where t is in seconds. How far is the particle from the origin (x=0) at the time when the particle is not moving.

answer is t=32 seconds, but I don't quite know how to solve for t this way.

2) A vector B, when added to vector C= 3i + 4j yields a resultant vector which is in the positive y-direction and has a magnitude equal to that of vector C. What is the magnitude of B?

I know how to add vectors, but I don't understand the wording here.

Answer is 3.2 m.

Thanks.

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# Homework Help: A couple basic physics questions(vector sum and kinematics)

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