A horse accelerates +2 mi/h/s south. Which option defines the horse’s acceleration?

The horse’s velocity increases by 2 mi/h every 1 s as the horse moves south.

The horse’s position decreases by 2 mi every 1 s as the horse moves south.

The horse’s speed changes to 2 mi/h as the horse moves south.

The horse’s speed decreases by 2 mi/h every 1 s.

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.