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Q.

A particle can move only along x-axis. Three pairs of initial and final positions of particle at two successive times are given Pair                   Initial position                    Final position  1                             -3m                                  +5m  2                             -3m                                   -7m  3                             +7m                                 -3mFind the sum of magnitudes of displacement in the pairs which give negative displacement in m.

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answer is 14.

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Detailed Solution

s1=5(−3)=8ms2=−7−(−3)=−4ms3=−3−7=−10m Required value =s2+s3=(−14)=14
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A particle can move only along x-axis. Three pairs of initial and final positions of particle at two successive times are given Pair                   Initial position                    Final position  1                             -3m                                  +5m  2                             -3m                                   -7m  3                             +7m                                 -3mFind the sum of magnitudes of displacement in the pairs which give negative displacement in m.