*12-48. The race car starts from rest and travels along a straight road until it reaches a speed of 26 m/s in 8 s as shown on the v-t graph. The flat part of the graph is caused by shifting gears. Draw the a-t graph and determine the maximum acceleration of the car. v (m/s) v = 4t – 6 14 v = 3.5t t (s) 4 5 26

The particle travels along a straight-line path with the motion described by the graph. Construct the a-s graph. travel the first 120 m if s = 0 when t = 0. v (m/s) 15 5 S+5 60 Also determine the time it takes to 35 +33 20 120 180 220 s(m)

07. At a given instant the roller A on the bar has the velocity and acceleration shown. Determine the velocity and acceleration of the roller B, and the bar's angular velocity and angular acceleration at this instant.

10. A small toy airplane is flying in the xy – plane parallel to the ground. During the time interval t, = Os and tz = 1s, its velocity as a function of time is given by m т i = 1.2 tî + (12- - 2t) At what values of t is the velocity of the plane perpendicular to its acceleration?