question_answer 36)

                  A graph of                  various                   is shown in Fig. Choose correct alternatives from below.                 (a) The particle was re4leased from rest at t = 0.                                (b) At B, the acceleration a > 0.                 (c) At C, the velocity and the acceleration vanish.                 (d) Average velocity for the motion between A and D is positive.                 (e) The speed at D exceeds that at E.                

Answer:

                  (a, c, e) At \[t=0,\,\upsilon =0\]                 Slope of \[x-t\] graph = zero, so u and hence \[a=0\].                 At C, slope of \[\upsilon \,-t\] graph = 0 and hence ?a? vanishes                 At D slope of \[\upsilon -t\] graph > 0 slope of \[x-t\] graph at E.