Question

need help for answering all questions and in need of an explanation for each answer.

Physics 11A, Spring 2020 Midterm 1.2020-03-04 Question 1- 12 multiple choice 1. The "strobe photograph" below shows a ball rolling along a surface. The camera flashed once a second, and the time is shown above each image. Which graph shows the ball's velocity vs. time? 01 2 3 4 5 6 7 8 9 10 11 12 OOO OOO OOOO L 2. An object's velocity vs. time is shown below. Which graph best represents the object's acceleration vs. time? graph best represents the object's acceleration w. w

Answer 1

The strobe photograph shows a ball rolling along a susface. The balls starts from o, and then its' Velocity increases and become constant and after some time its velocites decreases and then become Constant. Thus stre graph 4 is the best representation The object velocily a ackelaration a=dy. Por, AB , dr a positive for BC dr=0 for CD g d y = negetive. Thus graph c is the right a f ② when she r=0 Shen the sign of the acclaration become positive to @ xedat? The ball travel d, in Tsee. de £a 72 : a = 2 Now da £x ( 2 ) . ( 37) 2 - 24x97?= gd disfruce tomewe d = ad option cansar