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Velocity-time graph of a particle moving in a straight \( v(\mathrm{~m} / \mathrm{s}) \uparrow \) line is shown in figure. At time \( t=0 \), displacement of the particle from mean position is \( 10 \mathrm{~m} \). Find
(a) acceleration of particle at \( t=1 \mathrm{~s}, 3 \mathrm{~s} \) and \( 9 \mathrm{~s} \).
(b) position of particle from mean position at \( t=10 \mathrm{~s} \).
(c) write down \( s \) - \( t \) equation for time interval
(i) \( 0 \leq t \leq 2 \mathrm{~s} \),
(ii) \( 4 \mathrm{~s} \leq t \leq 8 \mathrm{~s} \)
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