Al was his sister, betsy, slide down the slide at the park. she held on to the sides of the slide the whole way down. when they got to the bottom, she noticed that her hands were warm. what caused betsy's hands to be warm?

The answer to your question is Friction

Explanation:

As is mentioned in the question, Betsy held on to the sides of the slide the whole way down, that means that her hands were rubbing the slide and this process causes a force called friction. And Friction is perceived as heat.

The definition of friction is: Friction is the resistance to motion of one object moving relative to another.

In your question her hands create a resistance to motion.

where is the circuit diagram ?

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