The velocity of air in the diverging pipe shown in Fig. P4.26 is given by \(V_{1}=4 t \mathrm{ft} / \mathrm{s}\) and \(V_{2}=2 t \mathrm{ft} / \mathrm{s}\), where \(t\) is in seconds.

(a) Determine the local acceleration at points (1) and (2).

(b) Is the average convective acceleration between these two points negative, zero, or positive? Explain.

Figure P4.26

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V = 41 ft/s (1) (2) V = 21 ft/s