Search "iota to infinity" Important formula & Concept Class 9 science: Motion: speed=distance/time velocity = displacement/time 1km/h=5/18m/s. 1m/s=18/5km/h average speed=total distance/total time average velocity =(u+v)/2 or displacement/total time a=(v-u)/t slope in pt-graph=velocity =(s2-s1)/(t2-t1) slope in vt-graph=acceleration =(v2-v1)/(t2-t1) v=u+at s=ut+1/2at^2 v^2=u^2+2as Force and laws of Motion: p=mv, si unit of momentum is kgm/s f=ma, si unit