I need help with question 3 part (d)

l. The accompanying gure shows the position versus time curve for an elevator that moves upward a distance of 60 m and then discharges its passengers. (a) Estimate the instantaneous velocity of the elevator at t = 10 s. (b) Sketch a velocity versus time curve for the motion of the elevator for 0 S t 5 20. Distance (cm) 4. The accompanying gure shows the curgss of four different particles movi For each particle, determine whether. locity is increasing or decreasing with S S .5' 4 Figure Ex-l i r ' r l (a) (b) (a) 2. The accompanying gure shows the position versus time curve for an automobile over a period of time of 10 5. Use the line segments shown in the gure to estimate the instantaneous velocity of the automobile at time t = 4 s and again at time t = 8 s. :8! Distance (mi A Figure Ex~4 FOCUS ON CONCEPTS S. If a particle moves at constant veloci say about its position versus time curv 6. An automobile, initially at rest, begin a straight track. The velocity increas suddenly'the driver sees a concrete be and applies the brakes sharply at time celerates rapidly, but it is too latethe the barrier at time n and instantaneous Sketch a position versus time curve tl sent the motion of the car. Indicate her of your curve correspond to the events . Distance (m) C Figure Eat-2 710 For each exercise. sketch a curve and _ 1 ing the stated conditions. tn 3. The accompanying gure shows the posrtion versus time curve for a certain particle moving along a straight line. Estimate each of the following from the graph: (3) the average velocity over the interval 0 S I _<_ the values of i at which instantaneous velocity is zero r gelocity either a maximum or minimum when st. l tangent to curve and intersects least two points. in exactly one po curve. different tersects third point>