Ahorse canters away from a trainer in a straight line, moving 116m away in 14s. it turns abruptly and gallops halfway back in 4.8s. what's its average velocity for the entire trip and using 'away from trainer' as positive direction? .

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.