the position of particle x depends on time t according to the relation x =(3m/s)t-(1m/s^2)t^2 yhe speed of the particleat t=2 s is
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x=(3m/s)t-(1m/s^2)t^2
x=3t-1t^2
dx/dt=v(speed)
thereforedx/dt=3-2e
therefore at t=2
v=3-2(2)
3-4
=-1m/s
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