A pencil case is dropped vertically from a height at rest and hits the ground 0.5 seconds later a) What vertical velocity did the pencil case hit the ground with?

b) What horizontal velocity did the pencil case hit the ground with?

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.

The actual answer is c force stays the same while direction changes