A car initially moves at 7.0 m/s for 12.0 s, then slows down and stops to a velocity of 0 m/s decelerating by -2.0 m/s2. What is the cars displacement? (2 marks)

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.