If displacement x of a particle moving along a
straight line varies with time t according to relation
x = 2t + 4e
–2t, then
(1) Motion of the particle is uniformly accelerated
(2) Speed of particle goes on decreasing with time
(3) Speed of particle goes on increasing with time
(4) Speed of particle first decreases and then
increases
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Answer:(2)speed of particle decreases with time
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