a) DirectF iile TopicDownload b)V c) V d) 8) Which graph in Fig. 2-2 mpresents a constank non-zeto velocity? 8) A)graph a B)graph b C) graph c D) graph d E) both graplhs c and d ? 9) Which gaph/s) in Fig. 2-2 represem(s) zero acceleration? 9) E)c and d A)onlya B)only b C)a and b D)b andc 10) Which gaph(s) in Fig. 2-2 represenit(s) constant positive acceleration? 10) A) graph a B) graph b C) graph c D) graph d E) both graphs c and d 11) 11) When is the avemge velocity of an object equal to the instantaneous velocity? A) never B)only when the velocity is increasing at a constant rate C) always D)only when the velocity is decreasing at a constant rate E)only when the velocity is constant 12) If an object is accelerating, it must therefore undergo 12) ll uchaune in sneed, C)a change in velocity Solution 8. In graph b), graph is parallel to the x-axis means slope is zero so velocity is not changing with time. 9. When velocity is constant slope is zero. Slope in velocity vs time graph is the acceleration so acceleration is zero in b). Similarly in a) velocity is constant and zero so again acceleration is zero. So graph a) and b) is the answer. 10. In graph d), velocity is increasing with time so slope is positive means positive acceleration. 11. e) only when the velocity is constant. .