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The velocity time curve of a moving point is shown in Fig. Find the retardation of the particle for the portion `CD`.
image.
A. `1 cm//sec^(2)`
B. `2 cm//sec^(2)`
C. `3 cm//sec^(2)`
D. `4 cm//sec^(2)`

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Correct Answer - B
`a = (v_(2) - v_(1))/(t_(2) - t_(1)) = ( 0 - 60)/(70 - 40) = - 2 m//s^(2)`

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