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Question 53: The graph given alongside shows the positions of a body at different times. Calculate the speed of the body as it moves from : (i) A to B, (ii) B to C, and (iii) C to D. Lakhmir Singh Physics Class 9 |
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Answer» (i) Speed from A to B = 1 cm/s(ii) Speed from B to C = 0(iii) Speed from C to D = 2 cm/sExplanation:The graph is attachedFrom A to B the graph is a straight LINE, from B to C it is a horizontal line parallel to the time AXIS and from C to D it is again a straight lineDistance COVERED from A to B = 3-0 = 3 cmTime taken from A to B = 5-2 = 3 secondsTherefore speed from A to B = Distance/ Time = 3/3 = 1 cm/sDistance covered from B to C = 3-3 = 0 cmTime taken from B to C = 7-5 = 2 secondsTherefore speed from B to C = Distance/ Time = 0/2 = 0Distance covered from C to D = 7-3 = 4 cmTime taken from C to D = 9-7 = 2 secondsTherefore speed from C to D = Distance/ Time = 4/2 = 2 cm/s |
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