A ball is thrown 6m above the ground. Its total energy at that point is 12 J. What is the total energy of the ball at a halfway point of motion

6J

Explanation:6J

Using the potential Energy formula;

Potential Energy = mass * acceleration due to gravity * height

If a ball is thrown 6m above the ground. Its total energy at that point is 12 J

Get the mass of the ball

12 = m * 9.8 * 6

m = 12/58.8

m = 0.204kg

The height of the ball halfway = 6/2 = 3m

Potential energy half way = mgh

Potential energy half way = 0.204 * 9.8 * 3

Potential energy half way = 6J

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min