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Figure shows the graph of the \( \mathrm{x} \)-co-ordinate of a particle going along the \( \mathrm{x} \)-axis as function of time.
P Find the instantaneous speed of particle at

W \( t=12.5 \mathrm{~s}( \) in \( \mathrm{m} / \mathrm{s}) \)
(1) \( 2 \mathrm{~m} / \mathrm{s} \)
(2) \( 8 \mathrm{~m} / \mathrm{s} \).
(3) \( 4 \mathrm{~m} / \mathrm{s} \).
(4) \( 6 \mathrm{~m} / \mathrm{s} \).
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