a. state the kind of motion that object has from A to B and B to c b. identify the part of graph where objects has zero acceleration.give reason for your answer. c. identify the part of graph where the object has negative acceleration. give reason for your answer.
Answers
Explanation:
(a) As we know that if the slope of velocity time graph is parallel to time axis then the body is moving with a constant velocity.Hence, From A to B body has an constant velocity of 40 m/s
From B to C, the body uniformly retards as the velocity changes with respect to time.
(b) From A to B, the body has zero acceleration (i.e, retardation) as we know that if the body is uniform velocity acceleration automatically becomes zero here in the graph as we know the body started from 40 metre per second and from A to B, when body reaches at B its velocity remains 40 metre per second.Hence there is no change in velocity and we can say that acceleration is zero in this part of the graph
(c)From B to C, the body has negative acceleration (i.e, retardation) as we know that if the body has some initial velocity u and after sometime t if it gains some velocity v, we can say the body has an acceleration a.if the initial velocity is greater than the final velocity the acceleration becomes negative that is retardation of the body is seen.similarly here at point B if we considered the initial velocity to be 40 metre per second it uniformly retards to 0 m/s by the time it crosses 45 secs.
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Answer:
Explanation:
(a) Uniform motion from A to B and non-uniform motion from B to C.
(b) AB because velocity remains constant from A to B.
(c) BC because velocity decreases from B to C.