• A person pushes a 50 kg rock with a force of 300 N along a horizontal surface for a distance of 2
m. The force of friction between the rock and
the horizontal surface is 25 N.
Calculate the work done by the person
- How much of work is done by the person against
frictional force?
- Find the net work done on the rock.
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it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

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