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CBSE Class 9 Answered

Observe the graph carefully and answer the questions that follow. (i)What type of motion OA, AB and BC represent in the above velocity-time graph? (ii) Find out the acceleration and retardation of the body.
Asked by Topperlearning User | 18 May, 2015, 11:24: AM
answered-by-expert Expert Answer

(i) In the region OA: velocity increases uniformly with time, and hence OA represents uniform acceleration.

In the region AB: the body is moving with constant speed, and hence moving with zero acceleration.
In the region BC: velocity decreases uniformly with time, and hence BC represents uniform retardation.
 
(ii) Acceleration of the body during OA begin mathsize 12px style equals fraction numerator 6 space minus space 0 over denominator 4 space minus space 0 end fraction equals 1.5 space straight m divided by straight s squared end style 
 As in the region BC velocity decreases uniformly with time; hence there is retardation.
Thus, retardation of the body during BC begin mathsize 12px style equals fraction numerator 6 space minus space 0 over denominator 16 space minus space 10 end fraction equals 1 space straight m divided by straight s squared end style 
Answered by | 18 May, 2015, 01:24: PM

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