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In which situation is mechanical energy conserved? A. a parachutist descends at constant speed B. a car...

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Physics

In which situation is mechanical energy conserved?

A. a parachutist descends at constant speed

B. a car slows down without braking along a flat road

C. a heavy crate is raised at constant speed via a rope andpulley system

D. a sled accelerates as it slides down a frictionless inclinedplane

____________________

Two spaceships have the same mass. Spaceship A has kineticenergy K and spaceship B has kinetic energy 16K. What is the ratioof their speeds, vA/vB?

A. 1/16

B. 1/8

C. 2/1

D.  1/4

Answer & Explanation Solved by verified expert
3.8 Ratings (366 Votes)
NoteAnd The total mechanical energy Kinetic energy Potential energyWhere m is mass of the objectg 98 ms2 is acceleration due to gravityh is height of the object from a reference level generallysurface of EarthV is speed of the objectQuestion 1A If the parachutist descends at constantspeed then the kinetic energy will not change Because speed isconstant but the potential energy will change because height ofthe parachutist is changing Hence the    See Answer
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