Question

90 10 0.5 1.5 2.0 time (s) (a)t-o Examine the speed versus time graph, The slope of this oraph is the acceleration. Calculate the acceleration at the given time, and then write Newton's second law in the vertical direction. There are two forces acting on the rugby player: the normal force, Fu and her welght. Salva for Fuar Don't forgat to convart the acceleration unlts to m (b) 1 = 0.5 s 211お Note that the slope of the speed versus time graph at 1-0 5 ·s equal to te slope at [ 0. Therefore, you should rind that the frue for part b is equal to the rorce ror part a N (c)1.1s This is the value of the acceleration at 1.1 s; you are looking for F2. the froe rrorn the bar. Sol e Newton's second law,丶> -0, for F N (d) 1.65 3024 Examina tha saus-tima graph. The slapa af this graph is the acrelaration. Calculate tha accalaration at tha glven time, and than write Nawtan's secnnd law in the vertical direction. Thare are two forcas acting on tha rughy playar: tha normal forca, Fuar her weight. So ve for Fh r: Notice that in this case s negative, so be sure to take this into account when you write your cquation. Don't forget to convert the acce eration un s to m s2.M and

Answer 1

. -me 7s.st (a) sloye fram to o.5 is acrelevchoy a= 15-0 1 S ^ , , f ma = ר5.sx o.3 : 22.63N [b) at t-o.SMcond-) f: 22.57(',' acce ewha^リ ot O) s