A 100 kg mass trampoline jumper jumps from a height of 3 m. Within the water, friction stops at 0.75 s. Calculate the acceleration and braking force to which the jumper is subjected.

Idont understand the question

It is d, all the other ones say incorrect answer .

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.