A125 g block of an unknown substance with a temperature of 90.0°c is placed in a styrofoam cup containing 0.326 kg of water (c 4190 j/kg.°c) at 20.0 °c. the system reaches an equilibrium temperature of 22.4 °c. what is the specific heat, c, of the unknown substance if the heat capacity of the cup is neglected?

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

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