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A particle moving in the +ve x direction has an acceleration, a=1004v2m/s2.

Determine the time interval and displacement of a particle when speed changes from 1 m/s to 3 m/s.

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FBD of the lift

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Using kinematic equation

v2=u2+2as

Given that v=3m/s,u=0,s=4m, we have,

32=0+(2×4)a

a=98m/s2

By Newton’s Law,

ma=TmgT=m(a+g)=750(98+9.81)T=8201.25N  or  T=8.201kNAns

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