How far must it fall to change its potential energy by 1 kJ?

Consider a block of concrete weighing 1 kg.

(a) How far must it fall to change its potential energy by 1 kJ?

(b) What would be the value of its velocity at that stage? A block of copper weighing 0.2 kg with an initial temperature of 400 K is dropped into 4 kg of water initially at 300 K contained in a perfectly insulated tank. The tank is also made of copper and weighs 0.5 kg. Solve for the change in internal energy of both the water and the block given C_V = 4.184 J/g-K for water and 0.380 J/g-K for copper.

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