Please help with the following questions

1 (a) quantity. Explain what is meant by a vector quantity and give an example of such a [2] Fig. 1.1 shows three coplanar forces acting at a common point. Find the magnitude and direction of the resultant of these three forces. [8] 20 N 10 N 270 450 15 N Fig. 1.1 2 A car drives along a straight road as described by the velocity-time graph shown in Fig.2.1. w/in s.I 20 15 - 10 - 5 t /s Fig, 2.1 Find the acceleration of the car at t = 2 s, t = 5 s and t = 8 s. What is the total displacement of the car? What is the average velocity of the car between t = 0 and t = 9 s