Question

Problem 4 A car travels along a straight road at a speed of 20 m/s, it decelerates uniformly to a stop over a period of 30 seconds; the car then it travels in the opposite of the original direction accelerating uniformly to a speed of 30 m/s in that direction over a period of 15 seconds a) Prepare a scaled time-velocity graph. b) Prepare a scaled time-acceleration graph. c) Prepare a scaled time-distance traveled graph. d) Determine average velocity of the car over the 45-second period (m/s). e) Determine average speed of the car over the 45-second period (m/s). 30

Answer 1

0.667 -- ta 5,= (20) 630) - }(2)-4301 S,= 600 - uso (a) S, = 600 - 450 200 - 300 m Sz = (3.815)+ 3x (*)*(1572 S₂ = 675 m asa 675-3000 = 375 Naug - 373 [8.33 m/ average spact & 675130 1 21,667 m/s let cich A