Question

A position-time graph for a particle moving along the x axis is shown in the figure below.

(a) Find the average velocity in the time interval t = 1.00 s to t = 4.00 s. (Indicate the direction with the sign of your answer.) 

(b) Determine the instantaneous velocity at t = 2.00 s by measuring the slope of the tangent line shown in the graph touches the curve. Indicate the direction with the sign of your answer.)

(c) At what value of t is the velocity zero?

Answer 1

Average velocity = Total displacement/Total time

Instantaneous velocity = Slope of tangent

0 velocity corresponds to tangent parallel to x time axis, i.e., at t=4 second