x (m) A position-time graph for a particle moving along the x-axis is 12 10 shown in the figure below. (a) Find the average velocity in the 8. time interval t=1.50 s to t= 4.0 s. (b) Determine the 6. instantaneous velocity at t= 2.0 s by measuring the slope of the t (s) tangent line shown in the graph. (c) At what value of t is the 12345 6 velocity zero? Figure P2.5

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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.