A race car moves such that its position fits the relationship x = (5.5 m/s)t + (0.65 m/s3)t3 where x is measured in meters and t in seconds. (b) Determine the instantaneous velocity of the car at t = 3.8 s, using time intervals of 0.40 s, 0.20 s, and 0.10 s. (In order to better see the limiting process keep at least three decimal places in your answer.) Δt = 0.40 s      m/s (Use the interval from t = 3.60 s to 4.00 s.) Δt = 0.20 s      m/s (Use the interval from t = 3.70 s to 3.90 s.) Δt = 0.10 s      m/s (Use the interval from t = 3.75 s to 3.85 s.

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.