This problem seems simple enough, I guess I just don't really understand what it's looking for in the (b) portion.(adsbygoogle = window.adsbygoogle || []).push({});

A race car moves such that its position fits the relationship where x is measured in meters and t in seconds.

x = (5.0 m/s)t + (0.80 m/s³)t³

(a) Plot a graph of the car's position versus time. (Do this on paper. Your instructor may ask you to turn in this work.)

(b) Determine the instantaneous velocity of the car at t = 3.5 s, using time intervals of 0.40 s, 0.20 s, and 0.10 s.

Δt = 0.40 s ____________m/s

Δt = 0.20 s ____________m/s

Δt = 0.10 s ____________m/s

(c) Compare the average velocity during the first 3.5 s with the results of (d).

The average velocity of _14.8_ m/s is (*d1*) much less than (d2) about the same as (d3) much greater than the instantaneous velocity.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Simple Motion problem

**Physics Forums | Science Articles, Homework Help, Discussion**