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The position of a particle moving on X-a...

The position of a particle moving on X-axis is given by
`x=At^3+Bt^2+Ct+D`.
The numerical values of A,B,C,D are 1,4,-2 and 5 respectively and I units are used. Find a. the dimensions of A,B, C and D b. the velocity of the particle at t=4s, the acceleration of he particle at t=4s, d. The average velocity during the interval t=0 to t=4s, the average accelerationduring the interval t=0 to t=4s.

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