Help me with this please

In a system, when potential energy decreases, then entropy also decreases. true false

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. the scale reads 830 n for the first 2.4 s after the elevator starts moving, then 930 n for the next 2.4 s. part a what is the elevator's speed 4.8 s after starting? express your answer with the appropriate units.