Aspacecraft is traveling with a velocity of +3250 m/s. suddenly the retrorockets are fired, and the spacecraft begins to slow down with an acceleration whose magnitude is 10 m/s2. what is the velocity of the spacecraft when the displacement of the craft is +215 km, relative to the point where the retrorockets began firing?

8.29 two streams containing pyridine and acetic acid at 25°c are mixed and fed into a heat exchanger. due to the heat-of-mixing effect, it is desired to reduce the temperature after mixing to 25°c using a stream of chilled ethylene glycol as indicated in the diagram. calculate the mass flow rate of ethylene glycol needed. the heat capacity of ethylene glycol at these conditions is approximately 2.8 kj/(kg k), and the enthalpy change of mixing (δmixh) is given below.