fluids mechanics, conservation of momentum question ,,,, need detailed solution

6-37 Water is flowing through a 10cm-diameter water pipe at a rate of 0.1m3/s. Now a diffuser with an outlet diameter of 20cm is bolted to the pipe in order to slow down water, as shown in Fig. P6-37. Disregarding frictional effects, determine the force exerted on the bolts due to the water flow