A ball is thrown straight upward with a speed of +12 m/s. What is the ball's acceleration just after it is thrown? (A) zero
(B) 10 m/s2 upward
(C) 10 m/s2 downward
(D) 12 m/s2 upward
(E) 12 m/s2 downward

Air is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. air enters the heat exchanger at 95 kpa and 20°c at a rate of 0.6 m^3/s. the combustion gases (cp = 1.10 kj/kg°c) enter at 160°c at a rate of 0.95 kg/s and leave at 95°c. determine the rate of heat transfer to the air and its outlet temperature.

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Which type of reaction is shown in this energy diagram ?