Answer:
The cart mark (a) has the most potential energy and the cart marked (b) has the most kinetic energy
Answer: nuclear fusion
Explanation: give me a brainliest
Answer:
The focal length is 
The radius of curvature is 
Explanation:
From the question we are told that
The magnification of the mirror is 
The distance of the person from the mirror(the object distance ) is 
The negative sign shows that it is been placed in front of the mirror
Generally the magnification of the mirror is mathematically represented as

=> 
=> 
Generally from the lens equation we have that

=> 
=> 
Generally the radius of curvature is mathematically represented as

=> 
=> 
Answer: 10.36m/s
How? Just divide 200m by 19.3 and you will get how fast he ran per m/s