Suppose and equation relating position, x, to time t is give by x = bt3 + ct4 , where b and c are constants.
Work out the dimensions of b and c

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one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

answer; how far out of place which the object finished relative to the starting location;

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