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a) Check that the dimensions of the following formulae are consistent where u isthe initial velocity, v is the final velocity, a is acceleration: \frac{F a}{v}=\frac{m v-m u}{t^{2}} b) Three forces act at a point O as illustrated in Figure 1. Calculate themagnitude of the resultant force and its direction relative to the line OX.

s=u t+\frac{1}{2} a t^{2}

Fig: 1

Fig: 2

Fig: 3

Fig: 4

Fig: 5